A business tycoon decides to adopt a stranger after he saves her life when someone tries to kill her. It turns out, the stranger has a murky past and while she tries everything she can to save him from it, fate brings him at crossroads with his past life.

Captain Puri a skillful sniper with a very firm heart found himself wavering for the first time after meeting his first love again. Dr. Napaschon was working as a volunteer doctor in a village near the border between Burma and Thailand when she along with her best friend got kidnapped by a Burmese rebel troop. His mission is to return Dr. Napaschon back to Thailand.Although his heart always pined for herbut her recent status has changed Dr. Napaschon is now his friend's girlfriend. Nothing is more torturous and hurtful than giving your whole heart away to someone who has no heart left to love you at all. The biggest obstacle for captain Puri is having to be in close proximity to her again. He has been through many missions before but this mission had him thinking hard. How can he restrain his heart? Between love and friendship, what will he choose?

Ruler of Your Own World is an MBC Korean drama series. It was written by In Jung-ok and directed by Park Sung-soo.