After Our Reunion, My Ex-Boyfriend Turned Dark

[Younger man + mutual first love + two male leads + rekindled love + melodrama + sweet romance] A new neighbor moves in across from Xu Suiwen's home. He's tall and handsome, with a cool, aloof look that's exactly Xu Suiwen's type. The moment he sees him, Xu Suiwen falls for him. So when the neighbor who stole his heart shows up the next day to apply for a job, Xu Suiwen agrees without hesitation. The neighbor is called Chen Mu. He comes from a troubled family, barely speaks, and is a little withdrawn. Xu Suiwen wants to help him and treats him with nothing but genuine kindness. After spending some time together, the two grow closer. An accident leads Chen Mu to discover that Xu Suiwen likes men. In his confusion, Chen Mu realizes he has developed feelings for Xu Suiwen. As they spend more time together, those feelings grow more intense, until he can't hold them back any longer. Chen Mu eventually works up the courage to confess to Xu Suiwen. When Xu Suiwen opens up to him, Chen Mu learns that the other man likes him too. The young men's love is passionate and intense. Once they realize their feelings are mutual, they enjoy a blissful period of being in love. But their happiness doesn't last. An unexpected turn of events forces Xu Suiwen to break up with Chen Mu. Ignoring Chen Mu's desperate pleas for him to stay, he cruelly casts aside the person he loves. Six years later, they meet again. By then, Chen Mu is the renowned heir to the Chen family, a prominent name in business, while Xu Suiwen is an office worker at a friend's company. After six years apart, Xu Suiwen discovers that seeing Chen Mu still makes his heart race. He assumes Chen Mu has forgotten him and thinks this is just a chance encounter that will go nowhere. But after that, Chen Mu begins showing up around him again and again...