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This is the Chinese language version of "The Princes and The Treasure" children's picture book with a same-sex marriage.

In the magical kingdom of Evergreen, beautiful Princess Elena is suddenly whisked away by an old woman. Undefeated champion Gallant and shy bookworm Earnest go on a quest to find "the greatest treasure in the land" so one of them can save and marry the princess. Along the way, Earnest and Gallant realize "the greatest treasure in the land" is not what they expected.
"You must go on a dangerous quest to find the greatest treasure in the land!"