廣秀遵循答應母親的遺願，將與好友承煥一同旅行，但在發現父親前往愛滋病診所的證據後，他為了跟蹤父親而違背承諾。在過程中，他看見母親的幻影，並發現父親曾與和尚相戀，於是他在深夜拋下病重的父親回去找承煥，兩人一同搭上一輛「明日列車」。
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