It seems he was recast. Kwon Haehyo is playing Jaejin's father in this drama. Other characters were recast, such as Lee Sena and Oh Jieun.
There is no information, or at least I couldn't find any, about LKY playing Noh Youngwon's father (as seen in the MDL cast list). If you look at the character introductions on the MBC website, something happened between Jaejin's father and Youngwon's father. Source: https://m.imbc.com/program/cast/1006435100000100000?pid=398748
Is MBC hiding LKY? .. They didn't hide him on Doctor Lawyer.
Tl;dr LKY was announced to play a character but now this character is being played by another actor. Where is the source for LKY playing Youngwon's father?
https://m.vidio.com/watch/8376622-episode-01
https://www.instagram.com/kplus_asia
I'm not from Southeast Asia, so I'm not familiar with them.
There's also Kocowa (but this is available in America and Europe I guess): https://www.kocowa.com/en_us/season/101976148/dog-knows-everything#689_3694_0
He was cast as Jaejin's father when this was a JTBC drama (in May 2023). Source: https://kisskh.at/article/lee-kyung-young-confirmed-to-join-kim-nam-hee-in-gaslighting
https://m.entertain.naver.com/now/article/312/0000611666
It seems he was recast. Kwon Haehyo is playing Jaejin's father in this drama. Other characters were recast, such as Lee Sena and Oh Jieun.
There is no information, or at least I couldn't find any, about LKY playing Noh Youngwon's father (as seen in the MDL cast list). If you look at the character introductions on the MBC website, something happened between Jaejin's father and Youngwon's father. Source: https://m.imbc.com/program/cast/1006435100000100000?pid=398748
What there is, is that actor Jeon Jinki plays a secret character who does not appear in the relationship character chart, named Noh Seon-ho (he was at the script reading). He was also seen at the wrap-up party with Kim Heesun, Lee HyeYoung, Kim Namhee, and Yeonwoo.
Source: https://twitter.com/yeonwoo_actress/status/1769692379999502798?t=qROaDDQuIeK-EeBEuZwHJw&s=19
Is MBC hiding LKY? .. They didn't hide him on Doctor Lawyer.
Tl;dr LKY was announced to play a character but now this character is being played by another actor. Where is the source for LKY playing Youngwon's father?