Kim Sun Joo, the founder and CEO of one of the nation's most prosperous IT companies, is a celebrated name in the industry. A comprehensive genius, Sun Joo has every aspect of his life under control. Although, as many people in his position can attest to, being at the top comes with a unique set of challenges that others lower on the totem pole may try to take advantage of - in this case, by any means necessary.Sun Joo was senselessly murdered by an unknown killer, but instead of leaving this life, his spirit somehow took up residence in his smartphone. Now trapped within his phone, Sun Joo might have spent an eternity there if Park In Sung had not stumbled across it and discovered him.A down-and-out university graduate who can't seem to find a job, In Sung, is shocked to find a phone inhabited by the spirit of Sun Joo. Sun Joo takes advantage of the situation and does his best to convince In Sung to help him; a task which becomes much easier once he mentions the hefty reward he’s willing to give In Sung in exchange for his services.In Sung takes on the role of temporary CEO after Sun Joo's untimely death, much to the chagrin of his secretary, Jung Se Yeon. Working together in secret, will the two be able to find those responsible for Sun Joo's death?
