An OB-GYN who seems to have it all hides the pain of running away from her family after a tragic accident, until a man who sees through her loneliness enters her life and changes everything.
Jun-kyung says that she's not into dating or seeing new people. It seems that she's living a perfect single life, but actually, she's struggling with loneliness every day. Jin-ho quits his job and decides to spend more time with the family. Jun-seo is a grad student who's worried about his future. He wants to be loved and love others, but a shocking incident changed him.
Mi-ran was a big part of the family's life. She was the center who gathered the family together. Ever since the accident, the family couldn't move on and just stayed there, hurt emotionally. Now that Mi-ran is gone, the lives of the remaining ones move on again. Jun-kyung runs into a man, Jun-seo's relationship is at a crisis, and Jin-ho decide to go on a trip by himself.
After the funeral, the family is back to their lives. While they are still absorbing the grief and sorrow, new people and events enter their lives. Jun-kyung gets closer to Do-hyun, and she even does something she'd never do. Jin-ho slowly opens up to Ja-yeong, who has taken care of him, as he is travelling alone. Jun-seo reproaches himself, thinking he's wasting his time.
Jun-kyung finds out about Do-hyun's secret. She's shocked and disappointed, but she can't get over him right away. Jin-ho knows that Ja-yeong is a nice person, and she's even interested in him. However, he questions himself if it's the right time for him. Meanwhile, Jun-seo starts to have questions about his relationship with Sol.
Jun-seo feels insecure because he believes he's not good enough for Sol. He receives an offer for an internship at a station, and he's happy to share the news with everyone. Meanwhile, Jun-kyung wants to become close to Daniel, Do-hyun's son, but things don't turn out as expected. Jin-ho makes up his mind and decides to pursue his happiness no matter what others say.
An unexpected guest visits the house, and Jun-kyung finds out about Jin-ho and Ja-yeong. She tells harsh things to Jin-ho, and Ja-yeong calls her to apologise. Jun-seo is frustrated as he breaks up with Sol, and Hye-on finally acknowledges her feelings toward Jun-seo. Meanwhile, Jin-ho tells his children about Ja-yeong and makes it official.
Jin-ho visits Mi-ran's sister and apologises for dating someone new. Daniel tells Do-hyun that he doesn't like the fact that Do-hyun is seeing Jun-kyung. Beom-jun announces to the team that he'll quit for a Europe trip with his girlfriend, and Hye-on is at a loss for words. Meanwhile, Jin-ho asks his kids to meet Ja-yeong.
Jun-kyung becomes flustered upon seeing Yoon-ju, Daniel's birthmother, after Daniel's performance. She leaves the venue, leaving the family to have a good time. Jin-ho plans to buy a campground, so he visits it with Ja-yeong. Then he tells his kids that he'll sell the house, which leaves Jun-seo dumbfounded.
Even after listing the house, Jin-ho is torn, thinking it's a shame to sell the house filled with his children's memories. Do-hyun comes up with an idea that would stop Jin-ho from selling the house and living together with Jun-kyung. Meanwhile, Yoon-ju visits Jun-kyung at her workplace, hinting that she could get back with Do-hyun.
Jun-kyung feels conflicted after seeing Do-hyun leave his studio with Yoon-ju. Despite that, Do-hyun decides to propose to Jun-kyung. Jin-ho invites all his family to the campground, and they have a nice bonding time. Meanwhile, Jun-kyung and Do-hyun visit an OB-GYN, and they receive shocking news.
Jun-kyung ends up asking Yoon-ju if Daniel is Do-hyun's biological son. She regrets it immediately, thinking she's hurt everyone. Ja-yeong gets diagnosed with Alzheimer's disease, devastating Jin-ho. Meanwhile, Do-hyun secretly gets a DNA test done on himself and Daniel.
Ja-yeong sees Jin-ho struggling, so she decides to leave him and admit herself to a nursing home. Daniel finds out that Do-hyun isn't his biological father and becomes dejected. Yoon-ju decides to leave Korea with Daniel. Meanwhile, the family holds a birthday party for Ja-yeong, and she confesses that she has Alzheimer's disease.
