Because of Feng Yuanyu's sad past, he has no confidence in himself and does not open his heart to others.However, one day when he returned to his hometown of Nagasaki, he reunited with Asano Taiyo, the only man with whom he had a connection that he could never forget.However, the joy of reunion only lasted for a while, and he encountered an accident.

In front of the grief-stricken Yu, a man who claimed to be a guide from another world said: “If you are willing to 'hand over your heart', then from now on, I will create miracles for you.” But the guide's condition of “ handing over his heart” was too cruel to Yu.What does it mean to exchange a heart for a miracle of rain?Then, according to the guide's “miracle”, what will happen to the two of them?Rain and Sun, who miss each other wholeheartedly, are intertwined with two people with completely opposite names. The purest love story this winter is about to begin.