I took a photo. I think they bloomed in February, and they are Prunus x yedoensis! Prunus x yedoensis have beautiful flowers! I really like them, and they smelled good too (they smelled like cherries)! For those who don't know, they are Prunus x yedoensis, also known as Yoshino cherry trees. It's true that they resemble Japanese cherry trees or cherry blossoms (Sakura). To me, they look like Japanese sakura flowers.
I love it !