Call Me as yours

In this world, each person always has their own better - half called soulmate. They were born with the same soul, fate arranged for them to exist only for each other. A person will cry when their soulmate is born. After you were born, if you burst into tears, congratulations, your soulmate has already been born, and now somewhere on Earth that person is crying too. If you don't cry, wait for the fated tears to fall one day.