According to legend, there is a rainbow angel who is in charge of the most beautiful rainbow in the world. He has always wanted to find his true love and goes down to the next world to find his love every thousand years. Now, he has descended to earth nine times. But I haven't found my true love yet. Seraph Milcah warned him that angels can only descend to the next world ten times. If they exceed ten times, they will be wiped out in a month after they come to the human world again. The Rainbow Angel descends to earth again, this is his last chance. It was also the first time he experienced the taste of love. But he didn't expect that the person he fell in love with would actually be another mortal with the blood of the Rainbow Angel, and what would be the outcome of their love.