Happy Dragons

synopsis

A retired secret agent happens across the mahjong collection of his late comrade-in-arms. He invites his three childhood friends to play, but when they start the game, they are sent on a real-life quest to find the "Golden Relic". The quest turns back time, making everyone young again. Determined to right some wrongs from the past during this journey, they deepen their friendship and learn new things along the way.