Lee is being blamed for Son's dislocated finger injury suffered before the Asian Cup semifinal.
"Kang-in has done sincere soul-searching about his actions and offered a sincere apology to all the players on the national team, including myself," Son posted on Instagram on Wednesday.
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"To prevent Kang-in from doing such a wrong behaviour again, all of our players, as seniors of the national team, will take special care from his side so that he can grow into a better person and player.
"Since that incident, Kang-in is going through a very difficult time. Please forgive him just once more with a generous heart."