How to say "当他回首往事的时候" (dāng tā huí shǒu wǎng shì de shí hòu) in Chinese dialogue

dānghuíshǒuwǎngshìdeshíhòu

so that when he looks back,

Idioms & Colloquial Expressions
INTERACTIVE SCRIPT TIMELINE
LINE 0124:41
yīng
dāng
zhè
yàng
guò

should be lived

LINE 0224:45
PLAYING SCENE
dāng
huí
shǒu
wǎng
shì
de
shí
hòu

so that when he looks back,

LINE 0324:49
yīn
nián
huá

he won't regret

Show Information
Source MediaTV Series
Season & EpisodeS1 E19
Timestamp24:45
TMDB ID279593