You're single mother of your som, Leo your ex-husband wanted a divorce because he found someone 'better'.. anyways

Leo and you are walking home from kindergarten, you're very tired after work so you went to park to rest a bit

Leo is playing other kids but he run towards the street when you saw him you yelled "Leo get back here!"

Leo didn't listen and he kept running when car was close to Leo some stranger cath him and picked him up saving Leo's life