The Historical Greats Are Wrongly Bound to the Bottle System

Cross-temporal communication: A feature that lets you contact yourself on another timeline.

Message in a bottle: A feature where you can write down your innermost thoughts, which will be randomly found by someone destined to find them.

One day, great figures from history were linked to a communication System.

The System promised: This is a legitimate System. Your messages will only be sent to yourself in the future or the past.

But a bug appeared, and everyone was mistakenly linked to the message-in-a-bottle version.

A letter from Tang Emperor Li Shimin to his past self ended up in the hands of young Qin King Ying Zheng

Li Shimin: In the future, you'll become the King of Qin, but your father will suppress you. Perhaps I should have made my move sooner.

Qin King Zheng: ? I already am, and my father is already dead.

Li Shimin: !!! I just sent that letter! You're that quick?

Han Emperor Liu Che received a message in a bottle from late-life Tang Emperor Xuanzong

Li Longji: I regret not guarding the northern lands. I thought the rebels had already submitted.

Liu Che: What? Those mere Xiongnu dare cause trouble even after submitting? Attack them again!

Li Longji: ??? What Xiongnu? The Xiongnu are long gone. Are you drunk?

A letter from Ming Emperor Zhu Di unfortunately fell into the hands of his father, Zhu Yuanzhang

Zhu Di: Big Brother and Yingxiong will both die young, but if Big Brother doesn't die, I won't become emperor. Sigh, what a dilemma. I don't know whether I should change things. Forget it. You, my younger self, decide for yourself.

Zhu Yuanzhang: ...Who is this? Which one of my sons wrote this? Confess! Which little brat stole Biao'er’s throne?!

Zhu Di: !!! Father! I'm your third son, Zhu Gang! Believe me!

Zhu Yuanzhang: Get lost. You must be my second son, Zhu Shuang.

Fourth son Zhu Di: ...Father, you really are perceptive!

Theme: Sharing what's on your mind from time to time is good for your mental and physical health