A one-finger engagement connects two people with different personalities from two different worlds. One is Liu Keren, an ordinary high school sophomore girl in China. She is lively and cheerful, loves to cry and laugh, and likes to cook. She is in a daze all day long. Another popular Korean star, Lee Joon, is a descendant of the Lee royal family. He is handsome, gentle and has the qualities that make all girls like him. What kind of chemical reaction will happen when two people meet together?