Lu Jingtang transmigrates into a book as the vicious side character. To stay alive, she hides her edge and tries to please everyone—only to unexpectedly win Fu Nanyu's heart. After her rebirth, Ji Yuyin turns dark and seeks revenge; her scheming backfires and only deepens the bond between Lu Jingtang and Fu Nanyu. Lu Jingtang is shocked to discover that her transmigration is actually a return to her original world. As the truth gradually comes to light, the entanglement among the three escalates.