Does anyone remember the title for a BL world-hopping novel with a seme protagonist, where one of the arc starts off with mc in the bathroom of a venue place and he bumps into the ml who came to friend gathering of his scum ex who dumped him for someone else, so seeing our mc, the ml asks if he could act as his "new boyfriend" to slap the scum ex's face. Mc's current identity turns out to be the son of a wealthy businessman who just came back to China and they were actually paired for a blind date later on that ml rejects without knowing the other party is the mc. Eventually, they meet again at another party where mc courteously continues to pretend to be ml's boyfriend. Please help, this is driving me crazy...