They add customer on LINE first. After gaining trust, they ask customer to deposit and invest, saying that they can make more money. When customer finds something wrong and wants to withdraw money, they would ask for a payment before withdrawal. Later, they would ask for one more payment because the first goes into wrong account. Then, they threaten customer to pay back the money that they borrowed from you. Customer will be blocked at last, and the money never comes back. They control all the accounts and deceive customers.