A demon overlord basically hell, whipped and turned bad ha

Monster filled, mutant zombies, ghosts and everything dark

but I kinda think Ouyang Ye have more scenes than ML in the first 50 chapters though

Yan Junyu originally rejected Qi Ze when he first confessed. Qi Ze was acting weak and naive to survive until he regained his cultivation and was strong enough to do suspicious things like be hyper competent, and not be overpowered and executed as a Federation spy. Although the naivety was an act, Qi Ze was being serious about his feelings because Yan Junyu is a hottie, and saved his life. He resurrects Yan Junyu after his mech goes haywire (sabotage by an evil spirit living in the internet), and thus Qi Ze's karmic debt is paid. YJ has been observing QZ in spirit form for 2 months, but QZ erases his memories as part of the resurrection to cut off their relationship. YJ has no clear memories, but has stolen QZ meditation technique and now has positive feelings towards QZ.

I can accept YJ having feelings for QZ, but according to QZ actions, he does the exact same thing for 2 other people.

He has been levelling up Ouyang Ye as payback for helping QZ by paying for his tuition and keeping his secrets, and giving him access to his uncle's black market connections. QZ's levelling up of OY means that OY is able to get revenge on his conniving cousin (half brother?) and distant father, who teamed up to drive out OY and his mother, even though OY is the eldest son.
Li Ziqian was going to die from his wounds if QZ didn't show up and save him. He gave LZ the option of becoming human again but it might take longer and he can't guarantee LZ would have the same strength, or pushing through the radiation/Zerg poison and becoming what in the cultivation realm would be a demon. LZ chooses the extreme power that comes with the demon transformation, and QZ gets nudies of LZ which they flirt about, and build him these rad black stone/metal arms. LZ now feeds on negative energy, and can get stronger by absorbing the negative slag of energy stones and radiation and evil energy. He also gets an upgrade and turns from a half eagle person into a dragon person, and now in battle mode, gets black scales and can shapeshift his limbs into dragon claws or any other weapon he wants. QZ also saves LZ entire clan when they are grateful and trust him, and accept his forewarnings about the danger of the royal family and the Mu clan.

QZ has been flirting back with these potential bfs by doing stuff like helping out OY then begrudgingly accepting his kisses before pushing him off and telling him to go train his new lot gifted powers; revealing cultivation secrets to OY like his artifict refining and keeping secrets like eating their purified meals together; building LZ's new body and complimenting his figure and LZ blushing about it; being with LZ when he suffers tribulations and pushes through to new strength; LZ regaining his place as next patriarch in his clan, and QZ is the reason why, etc..

they all have equal opportunity to grow feelings for each other, but YJ has been butting in and trying to cut them off. YJ observes OY and QZ having secrets and tries to join in, but they stop whispering because YJ doesn't know their secrets yet. YJ accidentally sees LZ's nude pics on QZ's tablet and snatches it and edits everything except the limbs out. YJ just keeps butting in to these private conversations, abusing his power to enter QZ and OY private box at an arena, and fumbling along.

I get the jealousy, and could maybe work with it, but YJ also wrongs QZ the most out of all the live interests.

he is the pushiest, he already rejected QZ and broke his heart, keeps using his power (not to help QZ in his latest scheme) but instead to wedge himself into QZ life. OY's uncle is a little wary about QZ and tells OY to be on his guard, which QZ appreciates because it means that Li Yu and OY aren't simple pawns for him, but are smart enough to work with him as colleagues. LY quickly warms up to QZ and becomes integral to gathering supplies for QZ and facilitating sales to generate money for QZ. LZ is always polite with QZ, and hos family is really nice to QZ as well! His parents really love QZ and say that if QZ can help, then they will always remember that - and also that if QZ is just lying about having a cure but it is sincerely giving their dying son some hope in his last days, they will still treat him well, because it is the best thing for their son!
YJ was fooled by QZ's acting and rejected him, but LZ's family said even if he is weak or a huckster, if his heart is good (which it is), we do not mind, we are grateful to him.

Compare this to YJ's bigoted family - YJ's dad is rude to QZ because he is a weak carbon based life form who went above his station and confessed to his noble son, and keeps taking down to him. YJ's bigoted grandfather, offended that a carbon base life form is applying to his school, rigs the exams so they are all the hardest possible ones out of the thousands of possible exams. And when he gets S's on them all, he rigs the exams FURTHER by adding on the hardest exam, a mech one. And QZ passes this as well.

what does YJ do after QZ passes the rigged exams his grandfather did to sabotage him? He abuses his power to get assigned as QZ's roommate, and forces his mutual friend out from QZ's exclusive mech partner, against their protests. And by taking Wang Yue's position as exclusive mech partner, he uses that title plus the title of guarantor to dictate what QZ can and cannot do in school.

Qi Ze was firmly held by Yan Junyu's hand, and walked towards the lake bed. He struggled a few times with reddened cheeks, but was stared at by the other party, and he couldn't help feeling depressed.

"Why did you kiss me just now?" Seeing no one around, he asked in a low voice.

"Kiss if you want, there is no reason." Yan Junyu's expression was serious, but the strength of his grip increased a little.

"Then you are just playing hooligans?"

"Kissing your own partner is also called hooliganism?"

"Since when did I become your partner?" Qi Ze couldn't stop.

"Whether you admit it or not, you are with me." Yan Junyu didn't intend to reason with the young man at all, he pulled him into his arms and kissed him on the mouth, and the kiss made the other party panting and dizzy before he stopped.

Qi Ze is a dude on the surface, but he is purer than anyone else on the inside. He is not someone who is really accepted by him, not to mention intimate contact, even dangling in front of his eyes will make him disgusted. It was the first time for him to have such a lingering relationship between lips and teeth, he didn't know how to breathe, he didn't know how to respond, he just instinctively s**ked the saliva from the man's mouth, his tongue twirled wildly, like a puppy.

Yan Junyu laughed as soon as he kissed her, his stern eyebrows and eyes finally revealed some tenderness. "Do you admit that I'm your partner?" He backed away slightly, but his lips were still pressed against the young man's lips, and asked in a hoarse voice.

"I don't admit it, you rejected me!" Qi Ze was panting very hard, his eyes were wet and his lips were red.

Yan Junyu seemed to understand something, and suddenly smiled lowly, "So it's like this. Because I rejected you and hurt your feelings and self-esteem, so even if you still love me, you don't want to admit it, right? That's good., this time it's me who pursues you. Don't tell me that my feelings for you are just curiosity or gratitude. If a person is willing to sacrifice his life for another, what else is it but love?"

Qi Ze retorted while wiping his mouth, "I didn't hurt my self-esteem! Who stipulated that I must agree to your pursuit?"

"If you refuse once, I'll kiss you once until you agree." Yan Junyu pressed the boy against the tree trunk, kissed himself, and then backed away slightly after kissing enough, and asked, "Promise me?"

"No...... Woooo..."

"Promise me?"

"No... uh..."

After five or six times in a row, Yan Junyu was satisfied, rubbed his lips against the delicate skin behind the young man's ears, and his voice was indescribable "Xiao Ze, it's easy for me to misunderstand that you are asking for a kiss on purpose."

Qi Ze was completely limp in his arms, with his buttocks supported by him, the back of his head pressed down by him, and his stomach still pressed He is a hard and hot giant. The two of them were already on the verge of blowing fire, if not for the wrong time and place, they would have rolled together in disbelief long ago.

"I didn't ask for a kiss..." Qi Ze retorted in a daze, and when he saw him leaning over to kiss him forcefully, he nodded quickly, "I promise, I promise, stop quickly." A strange heat wave swept over him, making him Both excited and scared. He vaguely knew what would happen if he continued, but he was not prepared for it.

"You agreed?" Yan Junyu put down the boy in his arms, with a little regret on his expression.

"I agree, let's go!" Qi Ze gave the man an angry look.

Another thing is because ML also previously engaged with the villain who was his childhood friend and thought was a good person. It took him many chapters to cut him off because it wasn't easy for him to accept he has been deceived for so long.