Yoon Si-yoon's childhood, when he couldn't call his mother "Mom"

In My Little Old Boy, there was a story about Yoon Si-yoon's trip to Mongolia with his mother.

My mother is young and very energetic.

She said that after giving birth to Yoon Shi-yoon at a young age, she lived apart from him to earn money and couldn't even call him "mom" for fear of not being able to work.

I think both of you have survived so well, even in such difficult circumstances.