Mo Momo traveled to an unknown time and space and became Yuwen Lemon, the princess of Yuwen Kingdom. While tracing the relationship between the emperor and Yi Zichu, he was kidnapped by Bai Yan. She unexpectedly discovered that Bai Yan liked her, and ran away in horror. After Bai Yan found out, he was about to snatch her back again. An Yixi who was passing by came to the rescue, and Lemon was able to escape. Hou'an also seems to have a secret affection for Lemon, but the confused Lemon doesn't know. . . . . .