In "Oasis" episode 4, Jang Dong Yoon continues to live while he yearns for his first love. The real reason behind their breakup is also revealed.

Unfortunately, the relationship between him and his old best friend Chu Young Woo is severed. Here's what happened.

The Truth Behind Lee Doo Hak & Oh Jung Shin's Parting

"Oasis" episode 4 begins with Lee Doo Hak (Jang Dong Yoon) saving Choi Cheol Woong (Chu Young Woo) from a crisis.

Angered by this, Lee Doo Hak, who's a second-in-command of the large gang, decides to continue living as a thug.

When the two young men meet again, Lee Doo Hak grabs Choi Cheol Woong by his collar when he learns the truth about their connection.

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Written by Elijah Mully.