Playing a DPS Role with Absolute Defense

Su Mo awakens with Absolute Defense at the start, yet he is determined to play DPS.
Because when he awakens Absolute Defense, he also awakens a growth ability.
Heart of Slaughter: As long as you kill an enemy, you can gain one attribute point.
The stronger the enemy you kill, the more attributes you gain, with no limit to stacking!
"Is it reasonable for you to stand and fight the boss as an output"
"If you can't even withstand, how can you keep attacking? A true damage dealer should bear the enemy's damage! And fight it head-on!"
"But the boss doesn't deal damage to you!"
"That's because its DPS isn't enough!"