Daniel Choi and Lee Jong Suk's age have become an amusing topic of discussion.
Daniel Choi was born in 1986, and Lee Jong Suk was born in 1989, making them only 3 years apart, but in 'School 2013', Daniel Choi plays the teacher while Lee Jong Suk plays the student. Lee Jong Suk revealed through a press conference, "The ages of actors that play the students range from 14 to 27. One of the students is the same age as Daniel Choi hyung."
Daniel Choi smiled sheepishly and said, "We're around the same age, but he's a student and I'm a teacher. It may be the difference in the things we eat, or maybe it's because of bias. Even in the sitcom 'High Kick', someone who was my age played my nephew. The reason why I keep playing the teacher and the uncle is because of environmental reasons", causing everyone to laugh as he tried to provide a reason as to why he is always cast to portray the older character.
Source: TV Report