I’ll be your dog starting today

“What am I? The dog that stays by your side.” The youngest son of the Chairman of one of the leading business groups in the country, Song Se-Yeon, grew up in a warm family. That is, until one day he loses his parents in sudden fire, and his only brother goes mad. When his whole world is crashing down on him, the Vice Chairman, Kim Su-Hyeok, appears as Se-Yeon’s guardian. In order to protect his family and his only brother, Se-Yeon chooses to become Su-Hyeok’s puppet... Then, on his twentieth birthday, he receives a letter saying, "I’ll help you escape.” As if bewitched by the promise of freedom, he visits the address mentioned in the letter, only to meet a mysterious man, Lee Hyun, who offers to be his master. (Source: Lezhin)