The letter of intent is just an intention, not a contract, but you signed an unequal letter of intent, which is your own fault (you can't have any labor relationship with other companies), and you should have read it carefully before signing it; Then I will sign a contract with other companies after they have written the employment time limit and have not received the official employment letter from the company. Look carefully before you sign something next time!

P.S. company doesn't have to break the contract, as long as he gives you a very low salary, you won't do it yourself! But you can put forward a reasonable salary according to the amount of liquidated damages, so that the company will not give you too low salary!