When a legendary Go master loses his title to a one-time friend and protégé, he sets out to reclaim it in a high-stakes battle of wits and skill.

A laid-back countryside detective Byung-su takes his family to the Philippines for his 10th wedding anniversary. In fact, his hidden agenda is to track down his old friend Yong-bae who scammed him and got away a few years ago. In Manila, Byung-su finds Yong-bae in prison for murder, and hears about the case surrounding 'Yamashita’s Gold'. Swayed by a share of the Gold that Yong-bae offers, Byung-su suddenly becomes embroiled in the case.

Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.

Two best friends, So-yool and Yeon-hee, dream of becoming the top artists in Seoul together. But their friendship doesn't last long as Yoon-woo, So-yool's first love and songwriter, falls in love with Yeon-hee and her voice. So-yool's feeling of jealousy and inferiority towards Yeon-hee grows by the day, and she eventually makes a drastic decision to bring the two lovers down.

Old age is an inevitable future for every human being. But these four old men are not willing to succumb to time or the younger generations; they are ready to make their own decisions and overcome any obstacle. They try to live the rest of their lives to the fullest and achieve life goals.