Sang Doo, Let's Go To School Episode 10

Sang Du feels deflated as he watches Bo Ri and Se Ri happy together. Sang Du is unable to keep his promise when Eun Hwan catches pneumonia and is then admitted to Min Seok’s hospital. He runs off after hearing that Zangga died. Shim Ran finally realizes that Se Ra was her daughter, Pal Ran, and that Bo Ri is her granddaughter. Sang Du learns that a gigolo is responsible for Hee Seo’s family problems and goes with her to find that gigolo. Hee Seo finds out that Sang Du is a gigolo and tells Ji Hwan about it. (Source: Kocowa)