Leaning on each other through thick and thin, a trio of best friends stand together as they experience life, love and loss on the brink of turning 40.
Son Ye-jin
Cha Mi-jo
Jeon Mi-do
Jeong Chan-young
Kim Ji-hyun
Jang Joo-hee
Yeon Woo-jin
Kim Sun-woo
Lee Mu-saeng
Kim Jin-seok
Lee Tae-hwan
Park Hyun-joon
An So-hee
Kim So-won
Kang Mal-geum
Cha Mi-hyeon
Park Jae-joon
Choi Hoon
Park Ji-il
Cha Yoo-hyuk
Lee Ji-hyeon
Kim Kyung-ae
Nam Gi-ae
Park Jung-ja
Song Min-ji
Kang Sun-ju
Gi Eun-you
Kim Joo-won
Seo Ji-young
Lee Gyeong-suk
Seo Hyun-chul
Jeong Hong-sik
Cho Won-hee
Kim Jung-taek
Lee Kan-hee
Yeon Jung-hwa
Oh Se-young
Jo Hye-jin
Son Ye-jin
Cha Mi-jo
Jeon Mi-do
Jeong Chan-young
Kim Ji-hyun
Jang Joo-hee
Yeon Woo-jin
Kim Sun-woo
Lee Mu-saeng
Kim Jin-seok
Lee Tae-hwan
Park Hyun-joon
An So-hee
Kim So-won
Kang Mal-geum
Cha Mi-hyeon
Park Jae-joon
Choi Hoon
Park Ji-il
Cha Yoo-hyuk
Lee Ji-hyeon
Kim Kyung-ae
Nam Gi-ae
Park Jung-ja
Song Min-ji
Kang Sun-ju
Gi Eun-you
Kim Joo-won
Seo Ji-young
Lee Gyeong-suk
Seo Hyun-chul
Jeong Hong-sik
Cho Won-hee
Kim Jung-taek
Lee Kan-hee
Yeon Jung-hwa
Oh Se-young
Jo Hye-jin
Son Ye-jin
Cha Mi-jo
Jeon Mi-do
Jeong Chan-young
Kim Ji-hyun
Jang Joo-hee
Yeon Woo-jin
Kim Sun-woo
Lee Mu-saeng
Kim Jin-seok
Lee Tae-hwan
Park Hyun-joon
An So-hee
Kim So-won
Kang Mal-geum
Cha Mi-hyeon
Park Jae-joon
Choi Hoon
Park Ji-il
Cha Yoo-hyuk
Lee Ji-hyeon
Kim Kyung-ae
Nam Gi-ae
Park Jung-ja
Song Min-ji
Kang Sun-ju
Gi Eun-you
Kim Joo-won
Seo Ji-young
Lee Gyeong-suk
Seo Hyun-chul
Jeong Hong-sik
Cho Won-hee
Kim Jung-taek
Lee Kan-hee
Yeon Jung-hwa
Oh Se-young
Jo Hye-jin