在一个特殊的国家里，人们习惯说假话，他们认为真实的情感不应该暴露出来。这里的居民总是用反过来说话，以避免直接表达自己的真实想法。但这个国家有个不同寻常的王子，他偏好说真话。

据说，这位王子生下来就体弱多病，一位神秘的修女带着他离开了这个国家，直到十六岁才送回来。然而，不久之后，他又因忧郁症而病倒。这一切都源于国王迎接他回家时，对大臣和宫女们说：“看我这儿子的模样，又丑又弱，我不希望他回来。”王子从小没在这个国家生活，所以当他听到这些“夸奖”后，便以为大家都不喜欢他，从此变得少言寡语。

尽管如此，这位年轻人还是很有教养，他对自己说：“其实父亲和大家还是爱我的，只要了解别人，不是听他们怎么说的，而是看他们怎么做。”但他的心中充满了渴望——希望父亲能对他说一句“我爱你”。

国王不知道原因，但决定让一个“丑陋”的姑娘陪伴着王子，以此来治愈他的忧郁症。姑娘们都希望被选中，但她们必须口头上表示出不情愿。而就在这个时候，一位名叫茉莉的大眼睛黑发姑娘，被错误地抓捕起来。她是一名旅行者，在旅店里帮助了一位善良老板，却误称老板为“善良可爱的人”，并且打包了老板家的金银财宝，说会以后偿还。

旅店老板带她到达了宫殿，国王详细聆听了事情经过，大怒道：“把她关进最好的监狱，让她享受清福！”意思是在外面砍头。但就在这危急时刻，king prince（即假話國之皇太子）制止了这一行为：“等一下！亲爱的父亲，让她成为我的妻子吧。”

茉莉见状解释道：“请让我说明，我和母亲路上遇到了盗贼失散，现在只想借点钱回去找母亲，我会还钱，请相信我。”King prince（即假話國之皇太子）第一次露出微笑，因为终于找到了一位能够正常沟通的人。他向全国人民展示了真正的友谊和理解，而不是简单的话语。

第二天，茉莉带着珠宝消失无踪，只留下一张字条给King prince（即假話國之皇太子）：亲爱的King prince，你的小玩意先借走，以后还你。这件事震惊全民，每个人都在讨论逃跑的“Queen”以及信任不足的心理Prince。

"孩子，其实问题很严重。“ King say to Prince. "Her actions violate her promise, I will bring her back and ask for an explanation." Prince turn around, hug his father and said," Thank you for comforting me, Father. I love you!" King felt a warmth in his heart and replied," Son, I also love you. Wait for your return."

The king decided that from now on in the kingdom of lies they would speak truthfully. The prince continued to search for Molly, who was helping many people with the treasure she had taken. She was actually the princess of the truth kingdom.

"I want to take her back to my country where it is safe." The black-robed nun spoke gently.

Just then a group of people rushed into the room: "Your father wants you dead! Come with me!" A minister embraced Prince warmly, something that would never have been possible before not even by speaking reverse as they were used to do in this land.

Even Molly was stunned by this change; it was completely different from what she had heard about this place.