Even though the MC said he's attracted to men, there's no ML... I admit that I suspected the system for a second, but neither the MC or the system are interested in one another like that, hahahahaha

So that's also the reason why all the arcs take place in BL settings.

1 - MC wakes up in a cultivation world, having been stabbed by his fiancee, who is weaker than him. He captures a cultivator to asks questions about this world (his system hasn't arrived yet) and accepts an assignment to kiil the new fiancee of his ex. By making him believe his ex is responsible for stabbing him, he gets an assignment to kill his ex. When his sytem arrives, he receives the assignment to let his ex fall in love with him and tell him he loves him. He changes his appearance and into that of the new fiancee and visits his ex. He shows his real appearance, stabs his ex and lets him tell him that he loves him. Mission accomplished, MC travels and enjoys the world 300 years until he runs out of money and goes to the next world.

2 - MC is now in a martial arts world. MC was the son of the leaders of the martial arts alliance and his family was a powerful martial arts clan. During his travels he fell in love with a man and insisted on marrying him. However his future husband turned out to be a leader of a demonic sect and drugged everyone at the party, killing everyone there. His mission goal is to get revenge on the sect, make his fiancee regret what he did and let him marry MC. He accepts a hit to kill fiancees right hand and puts the same drug as used on his wedding banquet in the body's foot and enters the sect who are having a competition. He explodes the body, rendering everybody powerless, forcing ex to marry him by killing his subordinates making him say he regrets and killing everyone from the sect.

3 - MC has been forced to be the lover of a 2nd gen rich boy because he looks like his white moonlight. He is thrown away when WM returns. His mission is to get rid of the stand-in status, make scum profess his love and make him feel what MC felt. MC finds the ex's competitor and convinces him to pay for a hit and tortures and kills ex. Then he convinces WM to pay for disfiguring himself and enjoys several years in this world becoming a member of an assassination organisation.

4 - MC is now a eunuch who has helped the present emperor get the throne. Afraid of his influence he framed MC and killed his entire family, leaving MC alive and sent as a concubine to concubine Lin. His mission is to let scum pay back what he owes (throne and feelings should be returned) and beg him (to help him). He convinces concubine Lin he will help her and her general father, spreads rumors about a ghost appearing and when emperor is sick in bed in regret and fear lets him beg MC to take him with him to the afterlife. Afterwards he kills him and spends the money he took (general refused to pay and wanted to kill him) in 1 1/2 years.

5 - MC wakes up in a futuristic world as an omega with an S-level mental power (the highest). The man he fell in love with had his glands removed and put into his white moonlight, a beta B-level woman, who becomes an A-level omega afterwards. MC became an A-level beta after the surgery. His mission is to retaliate against WM, prevent her from marrying MC's beloved and let him marry MC and become a famous person beyond the stars. MC starts sucking up to the new fiancee's family and gives them an advanced Zerg as trophee. He goes to the wedding between ex and new fiancee and brings along the Zerg queen whom he's fed a medicine to hide her presence filled with nanobombs, dressed up as a human. He then objects to the marriage and lets the Zerg Queen kill the guests at the wedding demanding to be married to the ex. He also demands a huge pay for saving the prince who is present as a guest. He immediately becomes famous in the universe (wedding is on TV) and after the wedding he kills ex and bombs the Zerg Queen with the fiancee. He escapes and spends decades as a space hitman.

6 - This time MC is haunted by a ghost who wants to possess his body. His mission is to find out if the ghost is sincere, seal it again and for MC not to be alone anymore. He finds someone to turn himself into a ghost, gets ghost companions and seals the ghost that haunted him.

7 - MC is an alchemist and wizard this time. He first falls in love with a prince who betrays him and expels him from his country, then falls in love with a travelling companion who betrays him because he wants the bones of a wizard to heal his beloved. So he joins a wizardctower to do research, and meets a kid with great talent in magic. He decides to raise him and when the kid grows up he professes his love for MC. They become a couple, but MC gets betrayed again. When his disciple gets a good position he tells MC he only sucked up to him to get more attention and is disgusted with him. After that he died in an experiment and MC appears. Mission is to let all his exes tell MC they love him and repent and take everything back they got from MC.
MC travels to the kingdom of his first love and finds out that he has died a long time ago. He decides to resurrect him as a ghost and ties him to a ring then tells him he needs money because he spent a lot resurrecting him and lets him kill people for payment. After a while he brings him along and finds his 2nd love. He lets the ghost distract them and hunt the moonlight towards him. He then kills the moonlight wnd take back what he got. Afterwards he pretends to save the ex to let him profess his love. Then he orders the ghost to kill him and takes back the sword the ex made from his bone. He travels back to his tower and feeds his ex-disciple something to make him drunk, lets him profess his love and make everyone believe he r*aped ghost and then throw him out of the tower telling everyone he is ashamed of him and kills him. Ythen he spends a 100 years as a contract killer, killing people and enjoy life.

8 - MC becomes a famous actor at the top. 3 years ago he fell in love with a beginning actor and heled him get jobs and get a best actor reward. Afterwards the lover denied having a relationship wit MC and started a smeering campaign. MC was somewhat depressed, had trouble sleeping and overdosed on sleeping pills. Mission is to star in the same movie as ex and win best actor award again and to let him profess his love for MC to his fans.
He forces the director of a movie ex plans to be in to accept him as main lead and ex as 2nd lead. He acts in the movie as a killer and wins best actor. He then kidnaps ex and films him asking him questions while telling him he is tied to a lie detector test and is filming this directly on tv. The last question is to answer wether he loves MC. After answering no first the detector gives him a shock telling everyone he lies. Then he answers yes. Afterwards MC retires as an actor and enjoys life for a year. Afterwards he leaves.

9 - MC is a consulting detective who is working on finding a serial killer. However he performs subpar because his boyfriend of 10 years broke up with him and tells him he wants to marry a woman. Facing criticism he commits suicide. Mission is to crack the case and bring killer to justice and to let ex confess he cannot marry a woman.
He posts pictures of his ex on his blog daily adding sentimental messages. He studies the case and finds the place where he thinks the next murder will take place and finds the murdere. He attacks him and wounds him, the deliberately lets him go. Because of his description the police find out who he is and lock the city so he can not escape. Then MC calls him (how does he find his number when he's on the run?) and acts like he is a ploceman admiring his work. He tells him he can get revenge by killing MC's ex. The killer grabs ex and threatens MC with that ordering him to let him leave the city. MC convinces ex to profess his love through the phone and then tells killer he will not help him. He leaves the world soon after.

10 - Mission this time is without the memory of the original body, without violating the description of the narration, clear all abnormal energy points in this world, including but not limited to: rebirthers, game players, traversers, infinite stream players...
MC is a student at school. He quickly finds some players, the ML whom original was in love with is reborn and professes his love, a classmate has transmigrated and falls in love with ML. MC invites ML to a hotelroom, drugs him by lighting a candle, stole classmates phone and tells him to pick it up in the hotelroom and goes out to get medicine and acts surprised when he finds them both on the bed. Kills ML later and classmate disappears, players decide to quit.

MC decides not to go back to his own world.