The RV upgraded from level 1 to level 4, using a total of 350 units of steel materials.

For the upgrade from level 4 to level 5, 300 units of high-strength titanium alloy are needed.

In other words, if Lin Hui wants to achieve a "perfect upgrade" for the RV, he needs a total of 650 units of blue titanium alloy.

For other top players, gathering even 50 units of blue titanium alloy would be a challenge, let alone 650 units!