How to Buy a Friend (Korean: 계약우정) is a 2020 South Korean television series starring Lee Shin-young, Shin Seung-ho, Kim So-hye, Oh Hee-joon, Min Do-hee, and Cho Yi-hyun.

Based on the Daum webtoon Friendship Contract by Laad Kwon, it aired on KBS2 from April 6 to 14, 2020.

[3] Two teenagers begin a contractual relationship — Heo Don-hyuk promises to protect Park Chan-hong from his bully if the latter helps him uncover the truth behind the suicide of his girlfriend.

The first script reading took place in January 2020 at KBS Annex Broadcasting Station in Yeouido, Seoul, South Korea.

[16] In this table, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.