Manhole (Korean: 맨홀: 이상한 나라의 필; RR: Maenhol: Isanghan Naraeui Pil; lit. Manhole: Wonderland’s Pil) is a South Korean television series starring Kim Jae-joong, Uee, Cha Sun-woo, Jung Hye-sung. It aired on KBS2, from August 9 to September 28, 2017 on Wednesdays and Thursdays at 22:00 (KST) for 16 episodes.

The drama drew a nationwide rating of 1.4% for its eighth episode. At the time, this was the lowest ever recorded for a drama airing in a regular time slot on broadcast television. Lovely Horribly recorded an even lower single-episode rating of 1.0% in 2018, but Manhole remained the primetime drama with the lowest average rating (2.1%), until Welcome, which aired on the same network and timeslot, broke the record in 2020.