Board Thread:Game Discussion/@comment-27109924-20160630064656/@comment-27311695-20160630103553

Not just gold upgrade, each upgrade is 25% off, I already bought 13 upgrades, wasted a lot of money and gold. It seems enter special events few days later is better all the time.

PS: The required upgrade is fully upgrade, so if you want 100% career, this is the best opportunity.