If China is unhappy about this defense cooperation this should be a sign to India that the products they are receiving are high quality. The Chinese would not be complaining if South Korea was selling them junk equipment:

China would see India’s attempt to expand defense industry cooperation with South Korea in artillery and anti-aircraft guns as “inevitably sensitive” given Beijing’s border dispute with New Delhi in the Himalayas, according to analysts.
After meeting with Indian Prime Minister Narendra Modi on Monday as part of his three-day visit to India, South Korean President Lee Jae Myung announced that Seoul and Delhi had agreed to upgrade their economic cooperation, focusing on vital sectors such as shipbuilding, defense and artificial intelligence.
Lee said South Korea fully backed India’s “Atmanirbhar Bharat” or self-reliant India policy and hoped to “actively” support the production and operation of Indian defense equipment and discuss cooperation such as in technology development.
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