The Adults Are Afraid That I Am His Sister

A girl who works in a museum traveled through time because of a porcelain cup. The heroine has no intention of falling in love, she just wants to be free. The vicious heroine kills him, and the heroine is super A and fights back. However, the hero is calm and has weird thoughts. The heroine, who is sober in the world, understands the righteousness and soothes his worries and concerns, and finally eliminates the barriers. At this moment... The crisis is coming again...