Hi My Sweetheart (Chinese: 海派甜心; pinyin: Hai Pai Tian Xin) is a 2009 Taiwanese drama starring Show Lo, Rainie Yang and Lee Wei.

To protect his identity as the heir of his family's wealth, Xue Bo, gave him an alias "Lin Da Lang," who is supposed to be a poor student.

At Zhejiang University, Da Lang meets Chen Bao Zhu (Rainie Yang): an eccentric, friendless alpha female social rebel.

Lin Da Lang becomes unconditionally persistent for her friendship and endlessly delivers a peaceful and constant variable of support and acceptance to her neglected life.

Unaware of Lin Da Lang's background, Bao Zhu teaches him the norms and social baby steps of everyday life.

At the same time, Da Lang – unaware of the conflict – wishes to propose and confess his true identity and wealth to Chen Bao Zhu.

Hiding his identity as Da Lang, Xue Hai plans to coerce Bao Zhu into falling in love with his new self, only to then dump her harshly in revenge.

However, after seeing Bao Zhu with He Yan Feng (Lee Wei), her high school senior/judo master, Xue Hai becomes jealous and soon realizes that he still has feelings for her.

Xue Hai then sets his mind on destroying the relationship of Bao Zhu and her "boyfriend", while he continually pursues her, often forgetting whether it's out of love or revenge.

Xue Hai, wanting to save his love, rushes in but is hit on the head and trapped under a wooden beam while trying to protect Bao Zhu.

Bao Zhu searches for him for months, and finally stumbles across the store and finds Xue Hai, but discovers that he has forgotten everyone in his life – including her.

But after realizing that he does not remember her and in fact has started to like the toy store owner's daughter, Bao Zhu decides to leave with He Yan Feng to Britain.