yes, it's taesung mother
But... that's a big age difference...
you can see it here
https://tkor.red/겨울_지나_벚꽃_시즌4_16화.html
A yuri ship in a yaoi and with miss ha ? So good ! But yeah that's a big age difference
IDC ABOUT THE AGE GAP AT THIS POINT , ill allow it
Ms. Ha has a kid Jia's age though, so she's probably 40-60 and Jia is 20 something... I'm all for Ms. Ha having a love interest, but I'd rather it be someone her age.
SPOILER (i think i'm not sure lol)
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The Ceo is taesung mom , are we getting a new ship with her and jia? (≧∀≦)