Revert "Hi. Toan here"

This reverts commit fee19df4024d4164a6f90b62c462a41d67105c39.
Revert "Commit from Zijie"

This reverts commit 87ee81d386daa6d866b0c56d2295a028d0604970.
Revert "Toan is here"

This reverts commit ab1b7e33a60a505738a5fd0c4ed514a6fb880e50.