K-pop fans are well-acquainted with photocards, the rare collectible items featuring the idols' pictures. 

They have become a popular collector's item among fans due to their rarity and exclusivity. The latest buzz in the K-pop world is the release of exclusive photocards of ZEROBASEONE (ZB1) members prior to their upcoming performance at KCON Japan. As soon as the cards were released, fans rushed to get their hands on them, with some fetching exorbitant prices due to their rareness and the members' visuals.

Member Zhang Hao's photocard was selling at about 59,000 Yen which is almost 435 USD, followed by members Han Yujin and Park Gunwook.

A joint photocard set of Zhang Hao and Han Yujin even went up to as high as 88,000 Yen which is 650 USD.

It's unbelievable that pictures can cost close to 700 USD, even for rookie idols. Netizens were surprised by ZB1's overwhelming rise in popularity in Japan.

Moreover, Boys Planet's song 'Jelly Pop' has been getting exclusive reaction from Japanese netizens as it managed to debut #99 on Billboard Japan Hot 100 list.

On top of that, ZB1's maknae-line members Kim Gyuvin, Park Gunwook and Han Yujin managed to enter Billboard Japan Hot 100 lyricist list.