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The actor is making a cameo on the third and fourth episodes as the security team chief of Cha Jung Woo's (Joo Sang Wook) company D&T Soft Ventures. He'll be butting heads with Na Ae Ra (Lee Min Jung) when he investigates her as a suspect in the company's data leakage.

Kim Sung Kyun stated, "It's been a while since I've stood in front of the camera following 'Reply 1994', and as 'Cunning Single Lady' is a sweet romantic comedy genre, I enjoyed filming throughout. I acted out a security team chief who's lacking a little bit of something, and although it's a short cameo, I hope you have fun watching it... It is a fun drama, so I look forward to its live broadcast and I will always cheer [the cast] on as a viewer."

'Cunning Single Lady' airs every Thursday and Friday at 10 PM KST.