Explanation

"Oh, guess who I met today." Yeom Tae said out of the blue while walking inside the apartment, "Your father." 

Haneul turned around to look back at him as she had walked inside before him. He closed the door behind them and the motion sensor lights turned off as he walked closer to Haneul. 

"What do you mean?" Haneul asked, "Why would you meet-" She paused, "Ah!" She nodded in realization, "You met him at the hospital or something?" She asked. 

Yeom Tae nodded, "Originally, I was coming to pick you up but Jiwoo suggested to me that I should invite Youngjae. So, I went to see your dad to get his permission." 

Haneul instantly raised her eyebrows, "So?" She asked, slightly stern with her voice and tone, "Did he permit you?" 

"Oh," Yeom Tae shook his head, "He said Youngjae was transferred to neurology so I need to ask them. I can just call Haru and get him a day off, right?" 

Haneul shook her head, "Not really."