By Ju-min Park BUSAN, South Korea (Reuters) – In a cram school in the South Korean port city of Busan, 70 college students packed into a classroom, chanting We can do it! as they studied for an exam they hope will guarantee them a job for life with Samsung Group. The promise of Samsung, whose sprawling business empire spans consumer electronics to ships, offers not only a good salary and benefits but also holds the key to a good marriage in this Asian country where Confucian traditions run deep. The twice-a-year recruitment rounds by the chaebol, conglomerates such as Samsung and Hyundai, have spawned a cottage industry worth millions of dollars as young Koreans do what they have done from the age of 5 – cram to get ahead. I came here at 10 this morning and will be preparing for the interview until 8 p.m., said 25-year-old Shin Seong-hwan, whose father is a Samsung employee near Busan.