Update at 6.10pm:
The man who was photographed helping his girlfriend to tie her shoelaces on the train has given his side of the story.
In an email to Stomp, Guigui spoke out against criticism about him and his girlfriend. He explained that they enjoy doing such things for each other.
He said:
"This morning, my friend told me that my picture with my girlfriend was on Stomp. I feel insulted by some comments.
"My girlfriend and I love each other very much, and I thought tying her shoelaces is a very common thing in our lives.
"We enjoy doing things for each other and making each other happy!"
Guigui also shared another photo of him helping tie his girlfriend's shoelaces, this time at home.
i wonder what the girlfriend enjoys doing for him