You're the Jealous Type

One day, Xiao Nian came home to his parents suddenly announcing he had an unseen fiancé, insisting they marry due to a childhood betrothal. Pfft, childhood betrothal? What era is this? Xiao Nian heard the man was a strictly upright university professor - quiet, honest, clearly incompatible with him. How could he tolerate this? So after a huge fight with his family that night, Xiao Nian hit the bars, got wasted, and met an incredibly hot guy for a wild night. The next day when his family arranged their meeting, Xiao Nian's jaw dropped upon locking eyes. What??? "We're just contractual partners, you understand?" "Naturally." "Free to date others during this time, no interference?" "Of course." But later... This Lu Zhizhou not only contradicted himself but also grew inexplicably jealous - might as well tie Xiao Nian to his waist. Xiao Nian loved riling up Lu Zhizhou - watching him act disapproving while falling head over heels. Witnessing a proper professor transform into a shameless rogue. Flirty-yet-cowardly bottom x vinegar-chugging tsundere top