Soo-hyun comes across magical pills that allow him to go back and forth in time. 30 years to the past, young Soo-hyun meets future Soo-hyun and learns that his girlfriend will soon die because of him. In order to save her, the two Soo-hyuns try to change the past together, but a completely new and unexpected past is formed that leads to a new future.
During fourth period, high schooler Da-jeong finds her classmate Tae-gyu dead in a classroom and Jeong-hun standing in front of him with blood on his clothes. In order to stop Jeong-hun from becoming the prime suspect, Da-jeong must help him find the real murderer, who is still inside the school building, under 40 minutes before period four ends.
Set in the Joseon Period, three beautiful musketeers fight against a powerful group who tries to overturn the royal family and gain absolute power. The leader of the Beautiful Three Musketeers is Jin-ok, a smart and righteous woman. Hong-dan is the only married woman among the three women. Ga-bi is the youngest among the musketeers and excels at fighting.
