HeyTea led a RMB 100 ($15 million) A round in upscale Seesaw Coffee as the Chinese bubble tea chain ups its investment in coffee, ChinaVenture reports. The proceeds will be used for storefront expansion, supply chain upgrading, and digitization. Seesaw, a Shanghai-based specialty coffee chain, operates more than 30 stores across five first-tier cities in China. [ChinaVenture, in Chinese]