Geun Jungwon is the most famous successful and well-settled businessman. Geun Eun-Hee is also known as a famous surgeon.  After completing their university they got married and continued their careers. 
They were happy in their little world but one-day Eun-Hee met Seon Soon-Ja who was attempting suicide. Eun-Hee saved her and brought her into their house. Jungwon wasn't happy with Eun-Hee's decision as he felt something weird toward Seon Soon-Ja but his love for his wife more than anything. 
Jungwon respected Eun-Hee's decision and agreed to let Soon-Ja live in their house, and then something changed all of their lives, something which they never imagined.

Mr. Geun's Second Wife

Mrs. Young opens her eyes as the flashback of her past fades away. "She took everything away from me. My mother, my love,my everything. I will never let her enter my life again." She sighs and looks out of the window. "Why did she come back? You weren't supposed to come here, Sang-Ki." She whispers as a tear rolls down her cheek. 


Heading towards Eun-Hee office Haneul is panting heavily. He holds the doorknob and heaves a deep breath before entering the office. "Eun-Hee." His eyes soften when they meet with her. "Are you okay?" She asks flashing a smile to him. "How can you act so strong when you are dying inside?" He asks. "I can't afford to break." She replied with a smile. "Don't push me away please, it hurts." He cries and sits in front of her. "You are the only one, the only thing I want, please don't leave me." He cries softly as tears fall down his cheeks. "We are not meant for each other." She answers, wiping his tears away. 


Night Changes