Casual San Francisco 49ers fans may simply know Dre Greenlaw as the linebacker who stepped up when Kwon Alexander was lost for much of this past season, and then helped secure an NFC West title with a goal-line stop against the Seattle Seahawks in Week 17.

Die-hards who have followed Niners news since last year's draft know a lot more about the budding star who just completed his rookie campaign.

Those who don't check out mentally when the season ends know about Greenlaw's youth in foster homes, and how a decision by one family changed his life. They've heard about why one New York Giants fan will always follow Greenlaw's career thanks to a courageous decision the linebacker made one night while with Arkansas. They know that Greenlaw continues to try to give back to foster youth in his community.

In case you don't know Greenlaw's story, NBC Sports Bay Area aired a feature on the 49ers linebacker that will bring you up to date and will likely warm your heart. You can watch it below.

The 49ers made Greenlaw a fifth-round selection out of Arkansas last year. The 22-year-old registered 92 combined tackles, a sack, two passes defensed, and an interception through 16 games and 11 starts in 2019.