yes. As long as the contents of the contract are legal and the signing of the contract is expressed by the true intentions of both parties, the contract is signed by only one party, but it is still valid if it is sealed by both parties or if both parties fulfill their main obligations. 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.