Won-tak-eui cheon-sa (원탁의 천사 / Wontakeui cheonsa)

Won-Tak's dad, an old-time con-man, was suddenly killed during a freak accident in the prison, just one day before his release. Having waited for so many years to be reconciled with his dad and to start a new life together, Won-Tak felt betrayed and vowed to ruin his own life and bring shame to his parents. However, unknown to him, Wong-Tak's dad has managed to strike a bargain with an angel to return to the living world as Won-Tak's new bestfriend...