assuming they'll follow the novel~

spoilers ahead
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juhan will find out he gu was meeting with his ex (feng zhang) and get really pissed/jealous and stop him from meeting ex. they start fighting over he gu. he gu becomes close with gu qingpei and they become kinda bffs (gu qingpei is actually a main character of the author's other story called "Beloved Enemy" where his love interest is Yuan Yang, another chaebol of a company gu qingpei leaves his and he gu's old company for). he gu finds out that juhan & feng zhang (ex) actually used to "date" and "fool around" (yes, in THAT kinda way) when they were like 16/15. he gu feels like an idiot in between the both of them. but eventually their "love" is dismissed as a childish thing, and he gu becomes the object of both juhan and feng zhang's "affection". juhan realizes he can't live without he gu by his side attending to him all the time so his behavior becomes obsessive to a point where he almost strangles he gu to death. they try to start over with the condition that juhan stops sleeping around, but he gu realizes he can't change when he hears a groupie moaning in his dressing room at a backstage of one of his concerts. to prove a point to he gu, juhan brings his band member to he gu's apartment (which juhan actually paid for, including he gu's land rover), and his member starts smoking weed. he gu is furious when he arrives. the police get there, they get detained because of the drugs, and song media's (juhan's father's company) lawyer advises for he gu to become a scapegoat. juhan hates that he gu has to shoulder his own fault, but does poorly at trying to make up with he gu (he keeps trying to offer he gu material things which he gu really doesn't want. juhan only understands the transactional nature of relationships). he gu is dismissed from his job at the company and considers working for gu qingpei. without telling juhan, he leaves for a solo trip to europe. juhan is furious and has hackers find out where he gu went and follows him there with his private jet. he catches up to he gu without he gu's knowledge and waits for him at his hotel lobby when he gu was about to check out. a dutch-chinese guy recognizes him and asks for his autograph. that chinese guy is actually he gu's tour guide, he yi. when he yi tells he gu he met juhan at the lobby (without knowing their history together), he gu says fuck the itinerary and flees the hotel. he and he yi go for a 3 month european escapade. he gu realizes he's likes he yi's company and they have sex where he gu tops for the first time. fast forward, juhan and he yi fight and he gu becomes unconscious. he wakes up in juhan's private island.

*edit because continuation:

it is clear that during their 6/7 year fuckbuddy relationship, he gu has been "intoxicated" with juhan and has been desperately clinging onto the hope that juhan will come to love him.
during this point, he gu has already began to open his eyes to having only been "intoxicated" with the idea of juhan.

after the fiasco that was he gu being kidnapped in juhan's private island, they return to china. after a while, he yi follows him to china and when juhan finds out ofc he goes crazy. juhan desperately wants he gu to return to him, remembering that he gu "always returns to him" despite all the fucked up shit he does. he gu gets a message from juhan detailing the status of the company of he gu's mother. he finds out that she is in a great amount of debt and that the company is going down. + the fact that his mother is in a failing marriage with her 2nd husband + she has breast cancer. he gu realizes that the only way he can at least alleviate this and save the company is by letting juhan (and his influential family's insane amount of wealth) intervene. he gu also gets a call that he yi has been detained for fighting with juhan. he gu knows that only by staying with juhan can all these troubles be solved. he confronts him in which juhan challenges him by asking him to have sex. when he gives in, he gets mad that he gu would offer his body saying that he wants he gu's heart instead. he gu has no choice but to stay in the palm of juhan's hands. he yi is released but at this point, he gu knows he can't stay with him so they go their separate ways.
fast forward, he gu speaks with juhan's mother about juhan's attitude and how juhan doesn't know what the meaning of love is. she promises to speak with juhan about his actions towards he gu. eventually, it is time for juhan's concert which he gu is made to watch on the tv by his half-sister. towards the end, juhan offers a surprise performance, a song called "AI HE GU" (because chinese language, apparently this can also mean "Why Love is a Sin" or simply, "I love He Gu". in this case, the meaning can be ambiguous). after this, juhan professes his love for someone to the audience (he gu knows it is him) and decides that he will retreat to the behind the scenes and become a songwriter instead (no longer becoming the huge personality that he already is). after this, juhan's fans begin to connect the dots about he gu and juhan's relationship. his personal information is leaked online and when he brings his sister to the airport to return to shanghai, he is harassed by a fans + paparazzi. juhan rescues them and takes their private jet to shanghai the next morning.
in shanghai, he gu meets with his mother's husband and discuss about their failing company. his stepfather and his son are greedy assholes that don't want their mother to benefit from potentially selling her shares. when he gu heads out, he gets abducted again! he gu wonders if it is juhan or a crazed fan, but no, the abductor is a crook hired by his devious stepfather! juhan once again comes to the rescue and fights with the abductor/s. he is almost beaten to death. at the hospital, he gu confronts juhan's family where juhan's dad blames him as always causing trouble to his son. in the end, he wants he gu to completely disappear from juhan. he heads to singapore to visit gu qingpei to cool his mind, but gets a call that the injured juhan doesn't want to eat/has become restless without he gu's company. he gu reflects on this and he returns to china. after further reflection & agreeing with juhan that in order to proceed with their relationship, they should have more communication with one another, he gu decides he will give "them" another chance.
over the course of their renewed relationship, juhan has proven to show some changes, in which he gu, though reluctant, is reminded of that time in their high school days when he was in a one sided relationship with juhan. basically, his heart has began to stir up again.

*apologies for doing a really bad job at explaining things. as you can see, the novel had so many things going on that it may be hard to summarize. also, there's alot that the manhua might omit from the novel to maybe simplify/solidify the plot so let's see where this takes us. but yeah, to make the long story short, he gu does end up with juhan in the end.