One day, Lucy Yujin, the daughter who became a king, returned to modern times. Yujin finally came to modern times after her daughter became king one day. "One Day Becoming the King's Daughter" tells the story of Alice Yujin, an ordinary college student of 19, who had an accident while dating her boyfriend Xiao Yi. After waking up, she crossed to Shao Lin, a three-month-old baby girl in the Rollo Empire (with the same name as her former life), and was killed by Emperor Si Yulie in the Rollo Empire baby girl drifting competition.