That photographer is a genius. I'm not one to think it's okay to out peoples' relationships, but it seems like him filling in Grandpa got him thinking to see if they'll be good as long-term stage partners. If that works out well, then their chemistry as romantic partners in real life would be fulfilled onstage as acting partners, creating the world's greatest kabuki duo. Like holy shit-- let's get those grandpas' romantic and tragic backstory, and FUND THIS ANIME NOW.
Spoiler pic from latest chapter posted on A1's Twitter got Director Kang looking like he's about to give his virginity to Yiyoung...
https://mobile.twitter.com/A1ninekiss/status/1273957029179084800
Hahah