Usage note
愿意表示心里同意或乐意做一件事,常常用在答应别人请求的时候。
yuànyì biǎoshì xīnli tóngyì huò lèyì zuò yī jiàn shì, chángcháng yòng zài dāyìng biérén qǐngqiú de shíhou.
It means being mentally agreeable or happy to do something, often used when accepting someone's request.