ML same as MC, he possesses characters from a few months to years before MC so if ML has kids or something they're not his.

Arc 1 - campus MC is bullied and abused as home, og committed su*cide after his crush said he was disgusted with him and should die. Turns out the crush didn't say that and was made up by his gf the og fl. ML is foreign company president who is good at hacking and competes against MC in hacking. MC joins his company (crush - also of ML tried in the competition to join company but isn't good enough. MC and him become friends after he breaks up with fl) and begins a good relationship with ml. FL tries to kill MC after efforts to get him to be bullied and expelled fail and goes to jail. MC and ML get together after a few years and MC goes down as 'robotics father' and they start a non profit charity to rescue mothers who were abducted to the mountains and their children.

Arc 2 - ancient MC is di son of marquis who is calculated by reborn FL to be a plagiarist and lustful. He has both legs broken and dies on doorstep under orders from his father who prefers his concubine. MC threatens coachman to take him to inn instead and bumps into sickly crown Prince ml. They part on good terms andc goes to mountain where a genius doctor will pass through and saves him from bandits. Makes deal that do for will teach him medicine if ms finds his daughter. In og reborn timeline FL pretends to be doctor's daughter because she had daughters pin but it was actually her maid. FL had her killed in the plague and killed doctor after she learns the cure for plague. ML helps bring captured daughter away from bandits and reunites with her doctor father while FL reunites with third Prince who she helped in the og timeline to become emperor and her empress. Plague breaks out in area they are in and MC helps doctor to search for cure while ML manages ppl and searches the cause of outbreak. ML gets plague and MC takes care of him, only to find out ML is his husband from last life due to birthmark in the exact shape he had a wound in last life to save MC. ML in last life said this mark will help MC find ML in next life, MC and ML get together and FL tries to steal completed plague formula and burn down the house where doctor, daughter, MC and ML were staying. She fails and goes to jail bit is let out by third Prince. Everyone is cured, goes back to capital and ML helps whitewash MC as he didn't do anything, FL goes to jail again but is rescued by third Prince. MC cures ml, emperor is grateful, there's a festival where MC sister goes on date with fiance but saves emperor from assassination (FL did it in og life) get discovered FL and third Prince hired assasin, get arrested then few years later ML becomes emperor, MC empress and go down in history as emperor who gained peace throughout the lands and MC as innovator in medicine, engineering and agriculture. Die in couple coffin.

Arc 3 - entertainment MC has ruined voice and reputation coz og protag was jealous of his talent and wanted to use him to write songs to make him famous and attract crush who is movie emperor (ml). Protag tries several times to blacken MC, fails then kidnaps MC to 'ruin' him. MC gives aphrodisiac to protag instead and escapes when he meets ML who looked for him. Protag and rich family are ruined, protag gets hit by car and MC writes new album with h songs he can sing, marries ML who is foreign Prince and hereditary noble then spend retirement travelling the world. ML has birthmark

Arc 4 - ger - MC is di sibling to FL who is reborn from apocalypse world and hates all gers. ML is emperor with children (he only arrived a few months before MC tho) and as soon as he hears of ger who burned in fire (FL tried to kill mc) he sends rare herbs and visits MC who is happy. FL gets imprisoned in house for getting hit by lightning which she summoned to try and burn ancestral hall, then tries to escape by taking MC hostage - she escapes and meets eldest Prince who loves her then contacts 'spare tires' second Prince, son of Duke and his bro in law. MC can speak to ghosts like fl, helps rid their grievances like telling son of Duke and bro in law that FL killed Duke's sis and bros wife. MC is recuperating in palace because FL injured him escaping and ML tries to get him to stay but MC is mad ML became emperor with harem, FL tries to seduce ML with help of traitorous nobles coz FL is secret enemy princess but fails coz it's ml. MC enters palace as queen, stops FL who wants to sacrifice 100 gers to eliminate all gers (FL mother did ritual once to get FL to have lightning powers) FL dies, eldest + second r cut off, MC improves agriculture 7th inherits + couple retire in countryside. Has birthmark

Arc 5 - scholar cultivation wuxia (?) MC is scholar who had his body taken over by og protag. ML is white fox (literally) who saves MC on way to school. Protags mother gave birth in a cave the same time as MC mother and babies got switched so when protag tried to sacrifice his family to bring his ghost lover alive it failed and protag died instead. Protag kills family, manipulates friend to kill MC and weakens him so lover can enter friends body and protag to MC. Friend fights lover, ML protects MC, turns human, MC uses mental power, lightning from heaven falls, injured him and kills two ghosts. MC + ML travel the world for hundreds of years.

Arc 6 - og protag is a little green tea bit*h - orc world MC is fiance of amnesiac og ML and protag is reborn from apocalypse who had his boyfriend stolen then died. Protag sees MC as one who stole his ex and tries to one up him in everything but MC doesn't know and just goes about his business. ML is eldest Prince whose beast core broke and is in constant pain. MC heals ml, goes to front lines and gets reputation for good pharmacist, MC exposes og ML as the one responsible for destroying MCs spirit power in youth coz og ML didn't want MC as his fiance so he triedto kill him. They both get punished in the end after protag is reborn again after the events of og timeline where after he married his ML coz protag couldn't get pregnant husband married a queen and protag was locked up by admirers to gamble on stones. ML gives up throne, traveling with MC. MC gets space from protag which turned out to be a space controlled by a 'fairy' who specialised in stealing ppls luck which is why protag was so unlucky after getting married.

Arc 7 - abo og protag reborn tries to have alphas defile MC but MC run away from cave before they arrive and run into invisible ml. ML has no memory of previous worlds but has memory of his life and that he is not the person whose body he resides in. ML falls for unconscious MC and fixes his genetic defects ie making him normal human and not omega. Protag tries to drug MC again but is caught, gets warning from art school then eventually expelled. MC family tries to sell him after protag blackens him online and MC live broadcast everything, making him have fans. He releases albums and ppl love him coz his spiritual power is soft in the songs. ML foxes genetics and there is no abo anymore. Protag is killed by alpha he keeps threatening

Arc 8 - culinary - end of last arc in system space ML heals cracks in MCs would and seals his memory saying it'll be a break for him. MC is born directly into the world so his damaged mental power can heal in this world and the world consciousness helps heal MCs soul. MC still has og personality, is ruthless and is only child of culinary family intermarried with family that has spaces. Mother dead, father did not remarry but after MC did not gain a power father brought a son 2 months younger than MC that inherited fathers golden tongue talent. System pretends to re-attatch to MC and after MC unlocks his space that combined with space that og host was supposed to get which can now ignore the rules of the world.c gets a cooking system that has recipes from all worlds. MC joins cooking competition to suppress illegitimate child, wins then meets ML the Duke who has all previous memories and give MCs memories back. MC + ML worship a teacher, join higher level competition to rise up ranks. MC gives up fathers inheritance and protag become second Prince chef to get away from controlling father, his mother releasing a recording saying father wants to embezel wife's fortune and mother says she og stayed coz she was afraid of him. MC + ML only stay till teachers death then leave world. Both systems integrate into space and become guardian

Arc 9 - cultivation ML loses memories coz heaven wants to swallow his power. Protag has harem but was killed by MC in previous life. MC meets ML in hidden realm, go out to meet his powerful family and trains. Protag picks fight with ML and during fight the 'main God' who made all systems to steal heaven power and make himself a body possesses protag to steal ML luck. ML destroys main god + heaven and heaven is put in charge of every single system after MC suggestion. Now systems will help Cannon fodder who were wronged by protags that have too much luck bestowed by heaven. ML takes MC to his world where he was bor

Arc 10 - extra MC world no memories, ML is computer controlling internet, can take human form. An Xi has system, makes him beautiful 'protag' winner of life. MC meets ML at auction, start renting together and An Xi tries exposing MC as PiraTe on internet. MC meets family as he was kidnapped by An family as child to exchange for An child. An Xi sends assasins with help of harem so MC breaks in and destroys rogue system on An Xi. MC becomes successful pharmacist, harem doesn't have system control so harem doesn't know why they were in love with An Xi. He begs for system after becoming ugly dk wat happens after.

Extra - replacement internet falls into wormhole to place like earth, vest as game boss, player comes every day to talk to him, falls in love happily ever after.

Extra - ancient world where MC + ML meet where MC forced to be villain. Didn't read yet idk

ML is the heavenly dao of his world. His world is sort of like the origin world which makes him far more superior than other heavenly dao from other worlds. ML got bored of his world and found a way to separate and went travelling as various creatures in the other worlds. He met MC as the prince in MC's 3rd world of being a villain, he got interested and decided to follow where he later fell in love. The main god of the system is just a book who doesn't want to disappear, he made the systems to gather energy. It was later turned into a unconscious being to manage all new systems that gets made from other worlds.