legal ground
Article 143 of the Civil Code of People's Republic of China (PRC)
A civil juristic act that meets the following conditions is valid:
(1) The actor has corresponding capacity for civil conduct;
(2) the meaning is true;
(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.
Article six hundred and eighty-nine
The guarantor may require the debtor to provide counter-guarantee.