Yeong Jae looks away but his eyes met Yoo Na's whose eyes were already staring at him with a small smile, totally lost in him.
Her smile fades away as she got caught and she coughs out loud, which slowly gets more with her getting choked on her own saliva, startled and startling the others as well.
"Yoo Na, what are you doing?!" Soo Min yells smacking Yoo Na's head in anger for being gross but she freezes when she realizes what she just did.
Oh-shit!
Everyone was surprised but Yoo Na was still coughing, Yeong Jae snaps back and he immediately stands pouring water in the glass and handing it to her, "Here. " he says patting her back while Joo Hyeok observes his son, how Yeong Jae was growing in concern made him happy.
He indeed was expressing himself, even though a bit he did, for now, that was enough.