Prince Koi, the Emperor's Father Begged Me to Ascend the Throne

[Time Travel + System + Luck of Koi + Court Strategy + Relaxing and Funny + Really Fragrant Slap in the Face] Su Chen, who traveled through time and became a useless prince, just wanted to be a salty fish and wait to die. Unexpectedly, he activated the koi system, killed the assassin with one arrow, and dug out the treasure. The eldest prince and the second prince had a bloody fight, but Emperor Qian patted him on the shoulder and said, "Fourth prince, how about you become the emperor?" All the civil and military officials in the court also praised: "His Royal Highness hides everything secretly, as it should be!" Su Chen: I'm really just lucky, don't make up your mind. (The introduction is weak, please read the text)