Wo Siduitou Zhongyu Pochanle

When he woke up, Ji Ran, the son of a rich second generation, found himself lying beside his arch-nemesis from his school days, Qin Man! Despite reluctantly agreeing to a sponsorship agreement with the green tea black belly enemy, Ji Ran finds his lonely and stubborn heart gradually melting by the occasional tenderness displayed by Qin Man. (Source: KuaiKan Manhua, translated)