一個願打，一個願捱 [－个愿－－－个愿挨]

Jyutping jat1 go3 jyun6 daa2 jat1 go3 jyun6 ngaai4
Pinyin yí gè yuàn dǎ ， yí gè yuàn āi

Definitions (粵典–words.hk)
  1. 語句
    一方​受到​另一方​好​差​嘅​對​待​，​但​係​完全​唔​介意​，​繼續​同​佢​維​持​關​係​；​啫​係​你​情​我​願
    used to describe a situation in which a person is treated poorly by another person, but does not seem to mind and continues to maintain the relationship with him/her; literally 'one likes to hit, the other likes to suffer'

一個願打，一個願捱 [－个愿－－－个愿－]

Jyutping jat1 go3 jyun6 daa2, jat1 go3 jyun6 ngaai4
Pinyin yī ge yuàn dǎ3 yī ge yuàn ái

Definitions (CC-CANTO)
  1. both parties are willing; one likes to hit whilst the other is willing to suffer [written and colloquial]