Mary (aka maria) is an ex-agent for private thieving companies, she's been on the run since she was 10, and when she encounters Jongmyeon at 13, she realizes that she doesn't have to steal or dance to make people happy, but once again, she has to leave him, and she's crushed, and along with stealing, she becomes a part time s, all of her flings reminding her of Jongmyeon, and she tries to forget that she's worth anything in this world and that someone will love her not because of her badly or her skills, but because of her.

Meanwhile Jongmyeon (aka Lance) is still recovering from Mary leaving him, she always told him that she was on the move, but the way she left him hurt more than words can explain. So he resorts to ing and stealing, he hates stealing but that's the only way to get money, at least that's what he thinks, and when he runs away, life gets hard, and he es even more. As much as it hurts him, he goes not only after girls, but guys, he's disgusted, but that's the only way he can reember and forget Mary. He decides to become a flight attendant, and in a flight to Peru he decides that death is his best option, but a familiar face stops him. 

This is a story of two young people who've been through everything too many times, and only want each other to be happy, but old bosses don't like that idea and the blackmail and threats get real.