Childhood is a romantic comedy that has ties to both men and women think about love and health, while challenging the diet to meet again an adult

Kim Young-Ho is a personal trainer for Hollywood stars. Even though he comes from a wealthy family background, he suffered a devastating injury during his childhood days. Now, he overcomes his problems with patience and stubbornness.
Kang Joo-Eun is 33-years-old lawyer. She has struggled to support her family.
Now, Kang Joo-Eun is overweight and not so attractive.

Despite his family's wealth, Young-ho suffered a devastating injury in his childhood. But he believes any problem can be overcome by patience and determination.
Kang Joo-eun was once an ulzzang in her teens, semi-famous for her pretty face and enviable figure. Now a 33-year-old lawyer, she's gained a lot of weight since. After getting dumped by her boyfriend and being told by her doctor that she has health issues, Joo-eun hires Young-ho to challenge her to diet and lose weight.
As they work on her physical transformation, they heal each other's emotional wounds and fall in love.