Jenny (real name Sun Caiyin, Park Jimin) is a middle school student, with a rich family, outstanding appearance and good study, and is very popular in school. One day, the boy Juno (real name Zheng Junhao, Jin Huicheng) transferred to Jenny's class. Juno is handsome and gentle, and he is also a master of games that boys dream of. Jenny heard her heart beating wildly. She fell in love with Juno at first sight, and Juno also had a crush on Jenny. So the two became inseparable lovers by fixing Jenny and Juno.
One day, Jenny said to Juno in a trembling voice, "You said you would stay with me no matter what I became. What if ... what if I have a child? " Juno was surprised. Seeing Juno's fear, Jenny was a little angry. She suggested arm-wrestling to decide what to do next, and whoever wins will listen to him. Jenny's slender wrist and Juno's strong wrist are intertwined. Jenny couldn't help shedding tears and told Juno what she felt. Juno was so moved that Jenny won. Both of them turned from crying to laughing because they were going to have their own children. ...
However, things are far from being as simple as imagined. Jenny began to sweat, her appetite increased greatly and she felt very uncomfortable. For Jenny's health, Juno not only brought fruit from home to Jenny, but also made money to buy food for Jenny by delivering newspapers in the morning. As long as Jenny says what she wants to eat, even in the middle of the night, Juno will jump up to buy and send it. But they also face other troubles. What makes Jenny angry is that some girls don't seem to know their intimate relationship and make eyes at Juno. In addition, Jenny's sister always barges in without knocking at the door, which makes Jenny unable to carry out prenatal education ... The young couple struggled alone in such a complicated environment, but still failed to wrap the fire, and Jenny's swollen abdomen was discovered by her sister.
Jenny and Juno are in chaos. The two were forcibly separated and could not meet. Juno was worried about Jenny and begged his parents to let him out, but to no avail. Seeing that both of them were in pain, friends decided to plan a good play for them. They took the opportunity of visiting Jenny to help her escape and arranged a wedding for them. In this way, this unique wedding was held. The guests were all students in school uniforms, and the bride and groom happily made vows. It seems that even the children in Jenny's belly are infected by the joyful atmosphere and respond enthusiastically with cheerful fetal movements. But can this love last and what fate will their children face?