Fans spotted this small detail on ASTRO Moon Bin's phone, and can't help but have their hearts warmed after finding out the meaning behind it.

Keep on reading to know more.

Fans' Hearts Warm After Spotting This Small Detail on ASTRO Moon Bin's Phone

In recent months, ASTRO member Moon Bin was spotted by fans with a cute sticker attached on the back of his phone. What drew attention was that the sticker was a female character with short hair and wearing a beige blazer.

With the huge success of the ENA drama Extraordinary Attorney Woo at the time, fans simply thought that the sticker might be the the drama's main character, Woo Young Woo, due to their resemblance.

Fans then noticed that Moon Bin had changed his phone case, and that all of the stickers on his previous one were not there anymore.

However, fans saw that the same sticker of a female character was there again, leading many to conclude that he kept the sticker and moved it to his new phone case.

Because of Moon Bin's simple action, fans began thinking that the sticker may have a special meaning behind it, and decided to ask the ASTRO member about it through the messaging app, UNIVERSE.

Regarding the sticker, Moon Bin revealed that it was actually his sister, Billlie member Moon Sua, who put the sticker on his phone. Not only that, but the sticker was a characterization of Moon Sua.

"Oh, this sticker? [Moon] Sua put it on my old phone case. It is not Woo Young Woo. It is a characterized Moon Sua. I don't know where you can buy it," Moon Bin said.

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Billlie Moon Sua is 'Touched' Moon Bin Kept the Sticker

Fans also asked Moon Sua about the sticker, where she explained that the sticker was a character of herself, and that she put it on her brother's phone case simply because she felt like it.

"I received some stickers from my fan, and I just put one [of it] on my brother's phone case. That is all," Moon Sua said.

When fans told Moon Sua that Moon Bin had changed his phone case, but kept the sticker, the Billlie member expressed her surprise and was "touched" by the gesture.

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"Really? He changed his phone case and he put [the sticker] on there? What...? Wow, I am a little touched," Moon Sua said.

Meanwhile, Moon Sua shared that the person she talks to the most these days is Moon Bin, and that she isn't afraid to send him an "I love you" text.

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Written by Robyn Joan