Can't remember the chapter. [SPOILER AHEAD]
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Jun was implied to have called Jaeyoung in a bar where he's with Happy addicts. Jaeyoung was convincing Jun to leave. Jun says, "Drink this for me if you don't want me to drink it," and hands him a glass with alcohol and a Happy pill in it. Jaeyoung just stares at it. Jun then drinks it and kisses Jaeyoung, pouring the alcohol and the drug into his mouth (like he did with the cop).

Did they already explain why the ass member from dream boys is the bad guy. Like I know he did something to jaeyoung, but like why did he do it? Did they explain that?? I can’t remember T-T can someone pls tell me if they did, if yes pls explain or tell me that chapterrr (●'◡'●)ノ