In tvN "Heart to Heart" Choi Kang Hee and Lee Jae Yoon's past relationship was brought to light.

On the 5th episode of tvN Friday/Saturday drama "Heart to Heart" broadcast on January 23rd, Jang Doo Soo (played by Lee Jae Yoon) and Cha Hong Do (played by Lee Jae Yoon)'s first meeting was brought to light. This was seven years ago.

On this day, Cha Hong Do's house had been raided by a burglar. Thus, the police came. Cha Hong Do was scared and hid in an alleyway. Jang Doo Soo said, "You must've been really surprised. Come out. If you stay like that, you're going to catch a cold" and tried to comfort her.

Afterwards, Jang Doo Soo left a cup and a note In front of Cha Hong Do's house for her to see. On the note, he wrote, "I remembered that last time, I was trying to catch the burglar when I broke your glass cup. I'm sorry. I don't know if you'll like this."

In addition, Jang Doo Soo also took precautions to fix the light in the streetlamp outside Cha Hong Do's house.

Meanwhile, tvN Friday/Saturday drama "Heart to Heart" features a doctor-patient relationship. Ko Yi Suk is a doctor who needs to get attention to survive. Cha Hong Do has a condition where she avoids people and cannot get the attention of others.