Waiting for the Coffin Opening

Sunny weather on April 4th This ancient tomb is empty, but it is really luxuriously built. I don't know who is buried here. Who cares? I'm just a grave robber. Sunny weather on April 5th Today I dug up a fist-sized luminous pearl. Yes, this ancient tomb is indeed valuable. But... Why do I always feel like something is wrong? This place is really unlucky. Cloudy weather on April 6th It's going to rain outside soon, so here is just the right place to take shelter. Hiss... Why are there more and more of these corpse crickets? Rainy weather on April 7 I don't know why, but it's getting colder and colder here. According to the structure of this tomb, it should be reasonable for it to be dry and hot, right? Is it because there is an air outlet inside that I don't know about? Forget it for now, sleep is important. Rainy weather on April 8 It's getting colder and colder here, so cold that I want to curse. Alas, I always feel like I'm lost? It seems... No? The door of that tomb is there, but I have never been there. April 9th... April 10th... Tsk, what time is it today? It's strange, how come the diary is missing a few days... It's outrageous. Since you don't know, let's calculate it as April 11th. The weather is fine today and I plan to leave this tomb. There is a lot of treasure, enough for me to wash my hands in a golden basin for the rest of my life... Wait, I have been in the tomb all this time, how do I know the weather outside? Also, how could the tomb door be in the side room? There is something wrong with this tomb! Anyone who sees this note, please don't touch anything here at will, don't be like me... And spend your whole life here with that person. Who is that person?