sked/Assets/Script/Character/EffectGain.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EffectGain : MonoBehaviour
{
    public Transform particle;
    public DropItem dropItem;

    public void OnGain(Character owner, DropItem drop, Transform target, System.Action OnEnd)
    {
        dropItem.item = drop.item;
        dropItem.OnInitialized();

        owner.OnGain(drop.gameObject, () =>
        {
            OnEnd();

            if (particle != null)
            {
                Transform particleParent = particle.parent;
                particle.SetParent(target);
                particle.localPosition = Vector3.zero;
                particle.localEulerAngles = Vector3.zero;
                particle.SetParent(particleParent);
                particle.gameObject.SetActive(true);
            }

            dropItem.gameObject.SetActive(true);
        });
    }
}