Invitados de la carta de amor temporada 1

Invitados masculinos: Shinhwa Group (JUN JIN, Andy, Shin Hye Sung, Eric, Kim Dong Wan, Lee Min Woo), Shin Cheon Jong (Shin Jung Hwan, Cheon Myung Hoon, Kim Jong Min), Lee Hwi Jae, Hong Kyung Min, Vuela al cielo (Hwanhee, Brian), On Joo Wan, Lee Seung Gi, Jung Tae, Lee Jeong, Becca, Eun Ji Won, Ho Nee Hoon, Tei, Choi Hyun Ho, Tim, Min Kyung Hoon, Yoon Tae, Jaja, Bae Jicheng, Chae Gun.

Invitadas femeninas: Han Ga-in, Kim Min-jung, Ha Ji-won, Han Eun-jung, Jang Shin-young, Han Ji-hye, Yoo Min, Lee Da-hae, Kim Sun -ah, Han Chae-young, Son Tae-young