Mr. Wolf, What Time Is It?

Text: Nakagawa Hirotaka, llustration: Yamamura Koji
Publisher: Gakken
1st edition: 2019.05.28~6th edition: 2022.10.01

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My Favorite Things

Text: Nakagawa Hirotaka, Illustration: Yamamura Koji
Publisher: Happy Owl Sha (Koseisha)
1st edition: 2015.02.06

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난 신기하고 이상한 것이 참 좋아!

My Favorite Things Korean version
Text: Nakagawa Hirotaka, Illustration: Yamamura Koji
Publisher: Gilbut Children Publishing
1st edition: 2017.11.01

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