When The Phone Rings

Baek Sa-eon (Yoo Yeon-seok) attends a party and Hong Hee-joo (Chae Soo-bin) accompanies him as a sign language interpreter.

Baek Sa-eon (Yoo Yeon-seok) invites Na You-ri (Jang Gyu-ri) to have lunch at the same restaurant where Hong Hee-joo (Chae Soo-bin) and Ji Sang-woo (Heo Nam-jun) are meeting.

Baek Sa-eon (Yoo Yeon-seok) and Jang Hyeok-jin (Ko Sang-ho) play indoor tennis at this place.

In a flashback scene, Baek Sa-eon (Lee Jae-joon) met Hong Hee-joo (Shin Yeon-woo) when they were kids and offered his food to Hee-joo since she liked it.

Baek Sa-eon (Yoo Yeon-seok) and colleagues have a lunch together.

While Baek Sa-eon (Yoo Yeon-seok) and Hong Hee-joo (Chae Soo-bin) come to a store, Hong I-na (Han Jae-yi) secretly watches them from afar.

While Hong Hee-joo (Chae Soo-bin) wants to treat Baek Sa-eon (Yoo Yeon-seok) for dinner, Sa-eon sees Ji Sang-woo (Heo Nam-jun) texts and invites Hee-joo for a drink.

Hong Hee-joo (Chae Soo-bin) —as Caller 406— calls Baek Sa-eon (Yoo Yeon-seok), but a truck nearly hits him. Hee-joo sees and rushes to him.

Baek Sa-eon (Yoo Yeon-seok) and Hong Hee-joo (Chae Soo-bin) join for the team dinner. Park Do-jae (Choi Woo-jin) gets a call and tells the caller is a woman and Sa-eon suspects Hee-joo.

Hong Hee-joo (Chae Soo-bin) meets Hong In-a (Han Jae-yi) at an aquarium. I-na reveals that she got surgery and now can hear, also she knows Hee-joo can talk.

While Baek Sa-eon (Yoo Yeon-seok) goes for a run, Hong Hee-joo (Chae Soo-bin) —as Caller 406— calls him and they agree to ask each other one question and answer honestly.

Baek Sa-eon (Yoo Yeon-seok), Hong Hee-joo (Chae Soo-bin) and colleagues join the team retreat at this place.

Baek Sa-eon (Yoo Yeon-seok), Hong Hee-joo (Chae Soo-bin) and colleagues go hiking. Other hikers recognize Sa-eon and start pushing to tale pictures with him, which allegedly causes Hee-joo to fall off the platform.

Hong Hee-joo (Chae Soo-bin) —as Caller 406— agrees to meet up with Baek Sa-eon (Yoo Yeon-seok). He asks her to meet him at a park where she had an accident with her family.

While Baek Sa-eon (Yoo Yeon-seok) takes a leave from work, Hong Hee-joo (Chae Soo-bin) admits that she wants them to do some things like other normal couples.

Finally, Hong Hee-joo (Chae Soo-bin) gets a chance to stand by Baek Sa-eon's (Yoo Yeon-seok) side on national TV as a sign language interpreter.

When Hong Hee-joo (Chae Soo-bin) passes out in Park Do-jae's (Choi Woo-jin) car, she imagines her and Baek Sa-eon's (Yoo Yeon-seok) life as a normal couple.

Hong Hee-joo (Chae Soo-bin) comes here alone, waits for Baek Sa-eon's (Yoo Yeon-seok) to come back to her.

Hong Hee-joo (Chae Soo-bin) goes to Argan, looks for Baek Sa-eon (Yoo Yeon-seok), gets kidnapped by the rebels, Sa-eon rescues her, and they end up making love.

Baek Sa-eon (Yoo Yeon-seok) —now Baek Yoo-yeon— remarries Hong Hee-joo (Chae Soo-bin) and they move to a new house.

Baek Yoo-yeon (Yoo Yeon-seok) comes to visit Jung Sang-hoon's (Kim Jun-bae) new restaurant.

Baek Yoo-yeon (Yoo Yeon-seok) returns to Korea and dates Hong Hee-joo (Chae Soo-bin).