Fu Lun Xian Zhi Fu Zong Ku Hong Yan

These 2 dramas are from the same source material. Leads are together in college but ML dumps FL to follow SFL abroad. FL's company has formed a venture with ML's company (which ML plotted) so that FL has to work with ML. FL has a sickly grandmother and a former boyfriend who also works at ML's company. SFL is evil.

Leads in both dramas have a relationship in college, ML follows SFL abroad, ML pursues FL after he returns in 5/6 years. Toxic SFL.