- Both are part of the sub-unit NCT 127.
- Both were SM Rookies.
- Both are Aquarius.
- Both debuted in NCT 127 at the same time, after the unit was already debuted.
- Johnny was born in 1995 and Doyoung in 1996.
- Johnny was born in USA and Doyoung in South Korea.
- They are part of the South Korean boy group NCT.
- Both appeared in the show Lipstick Prince.
| To view the JohnDo gallery, click here.