You can sometimes obtain codes which give a reward.
'Redeem codes' can be found in the setting. You can input a code to redeem gifts. Those codes will be given out by werewolf online.
After entering the code, the system will check if the code really exist. if the code really exist, you will receive your gift. If it doesn't exist, you will receive a lootbox with a yellow gift inside.
This link can be use to redeem codes in ios because ios users cannot redeem their code in the app of werewolf online.
1) เเวร์วูลฟ์ออนไลน์ (Werewolf online app) - (google playstore)