When Yona awoke, she has lost her memories! She was fed with lies about her life and who she is. However, she starts to unravel the dirty secrets of the Palace when she meets a 'beast' locked in the dungeon.

Finally, the Palace has captured the 'Thunder Beast ', a dangerous and infamous bandit. They isolated him in a dungeon far bellow where darkness is the only companion. A red-haired, lonely Princess gives him food and water every night, and she eventually fraternizes with him. Will he open her eyes and maybe….her heart?