The ML seems like tr*sh because it is soon revealed that MC is just being used as a replacement, but MC was just as bad, since he was only interested in the s*x at the start. Both parties had to come around, and should be regarded as two humans that have a hard time sorting out lingering feelings and coming to terms with their new emotions. So for those who say the ML is pure tr*sh, I disagree. Why should he instantly love and care for a ho*kup partner?

I have to admit, my favorite part is still the first half of the novel, where no matter what ML did, MC was like "This was supposed to be a one night stand..." in his head. Thoroughly eating snacks while other people baffle that he ignored the insults they spouted.

Hummiliation= brings the MC to a friend's high-end restaurant that discriminates against anyone not beautiful to let the owner humiliate the MC in front of him, not serving him food and denigrating him.

Emotional Torture and harm= Rips into pieces the MC's erot*c drawings in front of the MC while knowing that he treasures them;

Physical Torture and harm= Makes him insert a dildo filled with scalding tea up his chrysanthemum; Attacks the MC in a fit of insecurity and badly hurts the MC's wrist and after that makes him travel on a horse for days on end.

r*pe = After discovering the MC's stash of erot*c drawings, confines him in bed for a whole week, to the point the MC continuously begs for pardon and for him to stop with snot and tears for days; Drives his shaft in the MC's a number of times while he is unconscious and once when he is drunk.

Kidnaping= While the MC is unconscious orders his subordinates to kidnap him.

Coersion= After the ML rips the MC's erot*c drawings, he gets new ones and exchanges them for the MC coming with him to another city.

"He had no intention of devoting a single bit of his feelings towards anyone. His heart was concealed deep within him, surrounded by an iron wall, and he dared not hand it out easily." by Manager Rancui.

"Guan Shanjin cared for nothing. Since he was a child, his feelings had always been fickle, holding no loyalty to anyone. The pain and sorrow of people next to him had no way of moving him, and it was as though he had nothing to do with this world. No child had to learn how to be close to their parents, but Guan Shanjin needed to. (...) However, he was clever and precocious. Before others could notice that something was wrong, he already knew how to hide his nature, and pretend to be a normal child." by Guan Shanjin.

"His brain has never been open to anything else and has always been tightly shut since birth. Hence, he lacks a little of the emotions ordinary people should have." by Man Yue.

The ML remains cuddling with the love rival alone for months at a time and even near the end still keeps him as his lover with a physical/s*xual relationship. He keeps other people as lovers and guilt-trips the MC by saying that it was "for him" and "I had no choice" when he clearly had but decided to do it anyway. The turning point is when the ML decided to bring the love rival back when he was snatched by his fiancée. He had a choice on whether he would come clear to the MC before such a drastic decision, and if he truly cared about him, he would not have chosen such a method that at the end of the day was not really necessary, he could've protected the MC in other ways. Even though the ML's heart belonged to the MC, he was still having a physical relationship with the love rival, can't help but feel that the MC had a just cause for running away.

"Seems like Guan Shanjin himself hasn't realized it. He's making use of Adviser Wu to set Lu Zezhi's mind at ease and let him misunderstand that in the end, Guan Shanjin still left the substitute and returned to him. In my eyes, this isn't a noble move at all." Said by manager Rancui

"He was not alone. In his arms was Mr. Lu, and Guan Shanjin was lazily playing with his slender, marble-like fingers. "Why aren't you resting in your room?" Man Yue noticed the reddening of Mr. Lu's lips and the few red marks on his fingertips. He could not help but exclaim that Guan Shanjin was truly going all-in with his acting. Even he was about to believe that the favor Lu Zezhi was enjoying was real." by Man Yue CH 67

Another incident also happened at the very end of the novel, without consulting the MC first, The ML in one of his schemes brings another man back home and "feigns closeness" to make the man believe he had the intention of marrying him.

(Heavy spoiler) The ML doesn't really romantically love Mr. Lu, he likes worshiping him akin to a deity, something pure and unsullied because he himself is "dirty" and savage and couldn't see pureness in the world and when he finds it, he would keep it by his side and pamper it be it a dog or human, he didn't bother to find what were Mr. Lu's intentions as long as he remained near him and he could appreciate Mr. Lu beauty and perceived pureness.

Mr. Lu as well was using the ML because he wanted to live in luxury and be pampered so he calculated for the MC to fall in love with him.

Mr lu's end was way better than he deserved

I really loved their little talk the night before Mr Lu's wedding, the way they just opened up to each other and the ML calling himself s*upid for ever thinking the mc's idiotic expressions ruin Mr Lu's shadow

After signs up for the penpal service he writes some letters only to receive... d*ck pics. He's absolutely gobsmacked.

So what does he do?

Sends letters to everyone so that he can collect more d*ck pics, HAHAHA.

After MC and ML have their first tryst, MC pats his ass and leaves, causing ML to throw a temper tantrum and destroy half a building.

He's also a huge vinegar vat and rips up some of MC's top 10 favorite d*ck pics (leaving his own) so they have to go through great lengths to get them back later.

At one point, he sends a fake d*ck pic modeled after his own d*ck to try to entice MC but ends up getting jealous of his own fake d*ck so he forces MC to burn it.

Fellatio, rim jobs, urinary incontinence, dubcon, edging, and sounding among others.

You'd think that ML would propose marriage at the end of the novel, right? Wrong.

What does he give MC?

Box of 300 d*ck pics.

where Wu Xingzi finally grows a backbone and runs away. Intially I had good hopes for it, finally Guan Shanjin would have a chance to reflect and maybe we would get some character development like the gong apologising for using the shou as a substitute and treating him kinda shittily even for a s*x friend (dropping a sleeping Xingzi on the floor after heard Lu Zehzi was hurt). But no, it turns out to all be part of this huge plan Guan Shanjin had.

He then continues to 'date' the person who made the shou run away in the first place while he is meant to be hurt over Xingzi leaving. Whilst I understand why, what I really can't accept is that the gong constantly rips up Wu Xingzi's p*rn in a fit of jealousy, but the shou has to accept that the gong has to fake date Lu (his first love too).

as the shou didn't seem to care but by the end it is very obvious how jealous Xingzi is, mentioning his heart hurting and how pained he feels. Even after their resolution, Guan Shanjin still continues his fake relationship, never really acknowledging the Xingze having to live with that, past a quick 'oh I don't love him I love you'.

that he wasn't in love with his white moonlight but rather that it was a puppy love, fickle and fleeting. But throughout the novel he seems to treat his first love better than his 'real love'. Xingze is constantly slandered in front of him; his friend goes through significant effort to mock him, the city the gong lives in believes that the only reason he is dating the shou is as a substitute (and a bad quality one at that) and Lu insults him several times. In one of their first meetings the shou is berated by the gong for a mistake that Lu caused in the first place. Guan Shanjin makes little to no effort to remedy any of these situations. Even if the Wu Xingzi doesnt care (kudos to him) it is common decency to not want malicious gossip about your partner spread around. In fact in the novel it was mentioned that slanderous comments about Lu Zehzi made Guan kill Hua but this courtesy is clearly not given to those who slander Wu Xingze.

From having to leave his job because of him, to being kidnapped whilst drunk and then ignored for days while the kidnapper (gong) takes care of Lu Zezhin

even knowing about the betrayal, still loves anyway. Unable to stop and tearing himself apart over time because of it.