Is Klaytn proof of stake?

Inquiring minds may want to know: is Klaytn truly a proof-of-stake system? This question arises as blockchain technologies evolve and new consensus mechanisms come to the fore. Proof-of-stake, in its essence, relies on validators staking their tokens as collateral to participate in consensus. Given Klaytn's status as a promising blockchain platform, it's pertinent to ascertain its underlying consensus mechanism. Is it truly a proof-of-stake system, where validators' stake is at risk should they misbehave? Or does it employ a different approach? Clarifying this aspect is crucial for understanding Klaytn's security model and potential.