Nayoung

Nayoung is the ex-wife of Seok-woo & mom of Su-an who lives in Busan.

She was first heard talking to Seok-woo about their daughter. Nayoung also tells Seok-woo that Su-an wants to come to Busan by herself on her birthday & reminding him that it's the next day.

Then, she's kind of heard talking to her daughter when Su-an is in her bedroom. Nayoung tries to convice Su-an to let her father escort her to Busan. Su-an then hangs up when her dad shows up.

After that, Su-an and her dad are driving to the station and Su-an tells her that Seok-woo is driving her and that she'll see her in Busan very soon.

It is unknown what happened after that, as her phone was off when both Seok-woo and Su-an try to call her. We can only assume that she is probably either alive or dead, like Schrodinger's cat.

Relatives: Seok-woo (Ex-husband), Su-an (Daughter) Mrs. Woo (mother in law)