The king of the special forces

When Gu Cheng The King of Special Forces, was killed by a mysterious force while avenging his best friend's wife and daughter, he was unexpectedly reborn on his school a year ago, and even became a classmate with his best friend's dead daughter! How will he going to survive and protect his best friend's wife and daughter this time? The special agent with negative EQ reincarnated as a student and became popular with the ladies?!