cha juhan's phone (while investigating the wooshin group's corruption, prosecutor cha juhan is betrayed by his own chief prosecutor, hwang youngchan. captured by wooshin's thugs, he is sealed inside a steel drum filled with cement and thrown into the sea. some time later, a cellphone washes ashore. you happen to find it. who did it belong to? what secrets does it hold? and what will happen when you decide to pick it up?)