To be perfectly willing to do something; to do something of one's own free will.
心里完全愿意，没有一点勉强。多指自愿做出某种牺牲。
宋·王明清《摭青杂说·项四郎》此事儿甘心情愿也。”
She willingly stayed late to help her colleague finish the project.
Learn the next connected idiom: 心甘情愿 (xīn gān qíng yuàn) → 源源不断 (yuán yuán bù duàn)
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