The K-pop industry continues to mourn the loss of ASTRO's Moonbin after his passing on April 19. Many people have visited Moonbin's memorial prepared by Fantiago with heavy solemn hearts and left the late idol letters.

More of Moonbin's closest friends are leaving heartfelt letters to Moonbin as a last farewell. In addition to ASTRO members, his sister Moon Sua, VIVIZ's SinB, also visited Moonbin's memorial and left him a letter.

Known to be Moonbin's friend since childhood, SinB also bid her last farewell.

She wrote, "How is it there? Is it filled with everything you like? I hope so. We've known for so long, right? Since we were young. We've known each other for 18 years but I wonder why I was so embarrassed to say nice pretty things to you rather than grumbling at you. That's what I regret so much. I think I'll regret that, be sad, reminisce, and feel sorry for a while and think of you all day long. I bet you'll see me from there and sigh wondering why I'm being like that and feeling embarrassed. Please understand."

She continued, "Bin, I'll take care of Sua, aunt, and uncle (his parents) well just as you always asked me to. So, don't worry about anything else now and live for your happiness. I felt reassured and happy to be with you from our childhood to our teens and 20s. I thought I would grow old with you until we become grandma and grandpa but now I'll be the only one to grow old. You can laugh as much as you want while watching me grow old! later, when we meet, let's bicker as much as we want."

SinB continued, "Bin. You are my precious friend that gave me so much strength and reassurance just by your presence. I'm sorry I am only saying that now...Wherever I am, if someone asks who is my best friend, I'll confidently say it's you! Bin, who is so awesome and whom I am proud of, you're so precious! I'll come to see you often. Rest peacefully."