Tender Is the Night

Both movies show same plot, same character name about Chi Jing Yuan wants to paid Rong Yan for having sex and Rong Yan only ask for 200.000 RMB and return the surplus Jing Yuan added. Rong Yan desperately wants to block Chi Jing Yuan while other side scheming to involve Rong Yang on his life.

Wo Bei Lao Ban Shen Shen Ni Ai is essentially the same story with slightly different details.
a one night stand that leads to a marriage due to a pregnancy ending in a loving relationship.