a contract is not signed by one party on the spot, but it is generally valid as long as it is based on the true meaning of the parties. If only one party signs or seals the contract, if one party fulfills the main obligations of the contract and the other party accepts it, the contract is established. If one party to a contract did not sign it on the spot, but signed it afterwards and the other party accepted it, the contract was also established.

legal basis

article 49 of the civil code, if the parties conclude a contract in the form of a contract, the contract shall be formed when all the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in writing as stipulated by laws and administrative regulations or agreed by the parties. If the parties fail to do so in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established. Article 465 A lawfully formed contract shall be protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law.