avaricious, greedy, cold
惏 centers on an intense, selfish desire: being avaricious or greedy. The 'cold' sense is a less common extension, likely describing the emotional coldness that can accompany such greed.
惏 combines 忄 (heart/mind) with 林 (forest), but the historical development is uncertain. It may be a phono-semantic compound where 林 contributes the sound and the heart radical indicates a mental or emotional quality, but this is speculative.
The heart radical 忄 beside a dense forest 林 suggests a mind that hoards and desires like a forest thick with trees—greedy and avaricious.
For ラン, imagine a greedy landlord running through a forest, grabbing everything: run -> ラン, and his heart is full of greed.