Key's fans were left feeling blue when one fan stumbled upon his luxury apartment with a stunning Han River view listed on a real estate app.

The same upscale apartment that had been frequently featured on MBC's 'I Live Alone' is now up for sale, prompting a wave of nostalgia among fans who have followed Key's journey in the space over the past four years.

During his time in the lavish apartment, Key offered glimpses into his life, often hosting gatherings with friends. Through his regular appearances on 'I Live Alone,' fans had grown accustomed to the familiar surroundings.

Sharing the listing photos, a fan disclosed, "He moved out this week to another place," sparking a flurry of reactions from other fans:

"I can't wait to catch a glimpse of his new home on 'I Live Alone' soon."

"It's bittersweet to see him move out after four years. Feels like saying goodbye to a friend's house. I'm eager to see the new place too."

"Remember the house with the garden?"

"The new digs look slick."

"I'm intrigued by his new residence."

"I feel like I practically lived in this apartment with him through 'I Live Alone.' LOL."

"His moving must have been a massive undertaking, LOL."

"It feels strange seeing the place empty now. We've grown so attached to it."

"I'm excited to see his new abode now."

"Sad to bid farewell to this apartment."

"Who will be the next tenant?"

"Hard to believe it's been four years since he first moved in. Memories, right?"

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