Triangle (2014)

Triangle (2014) is an South Korean series which is aired on MBC. The series premiered on May 12, 2014.

When three brothers were very young, they lost their parents. The three brothers were then separated and lived apart for 20 years without knowing of each other. They then meet again unexpectedly and begin their relationship as brothers.
Jang Dong-Soo (Lee Beom-Soo) is the oldest brother. He works as a detective.
Jang Dong-Woo (Siwan) is the youngest brother. He was adopted by a rich family when he was a baby and became Yoon Yang-Ha. He is cynical and cold.