Kim Yong Guk (Longguo) has written a handwritten letter to fans following his dating rumors with SONAMOO's Nahyun and the controversy involving his pet cat Lucy. 

He's now left the following letter for fans:

"Hello. This is Kim Yong Guk. First of all, I'd like to sincerely apologize to the fans who've been emotionally hurt by my mistakes and careless actions. Though words are not enough to properly ask for your forgiveness, I'm writing this letter to you.

I wanted to post this and apologize on my personal Instagram, but my Instagram account has been hacked so I can't log in. Please understand why I'm uploading this on my fan cafe instead.

I became friends with SONAMOO's Nahyun after we met several times through gatherings with other acquaintances. I'm sorry for causing many people concern because of this.

It's true that I gave Lucy away and that I took her back. I'm full of regret about what I did back then, and I'm so sorry for causing her needless suffering. I apologize for causing so many people concern with what I lack in when it comes to caring for my pets. I will not forget the mistakes I made and will learn from it for the rest of my life.

I also deeply regret my actions on my own private Instagram account. As I write this letter, I'm ashamed of what I've done. I will live more humbly from now on and reflect on myself a 100 times before acting.

I can only ever be grateful to my fans, including now. It was thanks to you that I was able to receive a lot of love and make my debut. The fact that I let you down so badly makes me hesitant to open my mouth. The only thing I can say is 'I'm sorry.'

I will take all of your rebukes and advice to heart and work harder to become more mature. Once again, I'm sorry. Thank you for reading these words even though they're not enough."