Sang Doo, Let's Go To School

Sang-doo tries to take care of his sick daughter whose irresponsible mother tries to force her way back into their lives just as he reconnects with his long lost love.

Sang-doo finds work at Eun-hwan's school as a bodyguard. We also learn more about Sang-doo's past.

Sang-doo is tormented by Eun-hwan's younger brother at school. Eun-hwan becomes drunk and gets carried by Sang-doo to a motel.

Eun-hwan wakes up to find herself in the same room as Sang-doo. Sang-doo enrolls in Eun-hwan's school as a new student.

Eun-hwan's younger brother picks a fight with Sang-doo at school. Sang-doo gets into a car accident while trying to rescue a student from his school.

Sang-doo and Min-suk continue to battle over Eun-hwan's affections. Meanwhile, Sang-doo's popularity skyrockets at school and some jealous boys hatch a plot against him.

As Min-suk and Eun-hwan's plans for marriage become more finalized, Sang-doo does everything he can to convince her to be with him instead.

After being pushed away by Eun-hwan, Sang-doo stops attending school and is quickly missed by more than just his classmates.

Eun-hwan softens to Sang-doo after he risks his life to try to save her. As Sera becomes closer with Bori, complications arise.

Eun-hwan pulls away from Min-suk, but bad timing again makes it difficult for things to work out with Sang-doo.

When Bori's health takes a serious downturn, Sang-doo reverts back to his old ways to try to save his daughter.

Bori's illness brings Eun-hwan closer to knowing the truth about her relationship to Sera.

Even though it seems Sang-doo and Eun-hwan are fated to be together, the circumstances surrounding Bori's illness continue to keep them apart.

Sera and Min-suk withhold the shocking information that Bori is not his daughter in order to get what they want for themselves.

With the confession that Bori is not Sang-doo's daughter out in the open, everyone struggles to adjust to the news.

Just as happiness seems to be within Sang-doo's grasp, he is arrested and fate once more keeps him from his true love.